Malicious PDF — malware analysis report

Static analysis result for SHA-256 64950ed8f54313ef…

MALICIOUS

PDF

77.4 KB Created: 2020-10-17 09:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1ec749eee4f5cfc79a42af5e66e5c64c SHA-1: 54c0aca29af3f3026b937a6cd7a6e3f5d6199b82 SHA-256: 64950ed8f54313ef1ca9344a62bf28b520061f169f98a5513a646557b78c2f48
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body contains garbled text but also includes a URL that appears to be part of the link farm. No scripts were extracted, but the presence of numerous external links suggests an attempt to lead users to malicious content or manipulate SEO.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/123?keyword=tamil+tongue+twister+pdf In PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/2491377.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/fbd31b.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/xovaragimogerem.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/bobomovi_tepepajaparo.pdfIn PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/7588136.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/5058122.pdfIn PDF document text
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/pigaluzunenoruge.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/73da14fc.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/goxarujemexogu_mosegozivi_fofuwad_kezobal.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/4737059.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/bawap.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/bivuzijerojojofo.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/delelides_dasexurekiwar_jajumab.pdfIn PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/6083622.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ffa0201a-167d-4781-adaa-421de4fae7f4/sodutujatumeduta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835d53a1-9efe-46a1-aea9-f26c7ae5d7f0/10917693351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d13673df-324e-4108-8537-8ede82c16974/70937675632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44450c1-a3df-4f10-9338-95b3b29c0c7f/kozapilesezida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c717a7cb-beb5-4dd1-81a3-800e7dcb5d92/setitivewitezebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2435/3960/files/prentice_hall_economics_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2729/1048/files/topic_4_cell_division_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8496/4540/files/identifying_vertebrates_using_dichotomous_keys_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000888b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x888B 9804 bytes
SHA-256: 205f85d40abb2625f3fcb98938ae1565da9d49d0ccbc5863e039220fe41be918
font_00_sfnt_off000076a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76A7 5284 bytes
SHA-256: 4039d05c02a034f72775933dfebce8513b2d1e0e479e0180d2099d1427876fbb
font_02_sfnt_off0000a250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA250 4140 bytes
SHA-256: 7073f777ec002e82a856420936458262fa3cc3b4ee0437ed56f01fa51c4379d2
font_03_sfnt_off0000af6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6E 3048 bytes
SHA-256: 2f58f42410b60611991c12283e964e03297a95500ca09b14f4d605296bc50bc4
font_04_sfnt_off0000bb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7C 2108 bytes
SHA-256: d117309382da938f7dffedc42f90dd4217b4d540d75629b80669d975ecbc171e
font_05_sfnt_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 14668 bytes
SHA-256: ee7828dfc7388fcefa3313b17040ff68b85284ffb0ff3cf8ea56256cc9eab840
font_06_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 16364 bytes
SHA-256: 560548190d3588af37ebd144b10067da26eafb353cf82387b3a26894bc5052bc
font_07_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_08_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 2832 bytes
SHA-256: ee8afa51e50492bdf4d25b6b01818d2021856a0eb5271b70f188e6d094f25891

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