Malicious PDF — malware analysis report

Static analysis result for SHA-256 301a50d9a3f64c16…

MALICIOUS

PDF

65.3 KB Created: 2020-10-15 08:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6e0f6071060ca3a8e33fae55f2f47628 SHA-1: 2a984049306180a97db250e0e9589a1951e82b7f SHA-256: 301a50d9a3f64c1667faf404e395a017a67b88b114814461da7616a40a9ef0f9
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirect to potentially malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially obfuscated, contains a URL that matches one of the embedded links, suggesting an attempt to lure the user to a malicious site under the guise of providing sheet music.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gettraff.ru/123?keyword=cantina+band+clarinet+sheet+music+pdf In PDF document text
    • https://pobezewimo.weebly.com/uploads/1/3/2/6/132681951/5041981.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/tilit-masib-gudokololopi-nerirewuzek.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/noxununaten_fubevif.pdfIn PDF document text
    • https://site-1042738.mozfiles.com/files/1042738/18287323033.pdfIn PDF document text
    • https://site-1041591.mozfiles.com/files/1041591/xadizonev.pdfIn PDF document text
    • https://site-1039305.mozfiles.com/files/1039305/33457938619.pdfIn PDF document text
    • https://site-1039190.mozfiles.com/files/1039190/68149448673.pdfIn PDF document text
    • https://site-1045390.mozfiles.com/files/1045390/nulozagelovi.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/wijiliso.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/76c30d49.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/403847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9641/1812/files/oak_leaf_identification.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4902/5188/files/bark_avenue_grooming_okc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3515/9456/files/campbell_biology_in_focus_ap_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2874/1285/files/mitape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5278e38f-877a-47b0-a41e-89c084022a76/daxewevewawejunubekalutes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602ec0f1-c028-46f9-9de3-85ee010c34c1/64160724259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6db0520-ac79-4d3e-95d1-8ce085804d3f/80740332246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62aff67-0be5-496d-9ef6-e7e2f68c50e4/51846413969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e72be1-b58b-41e1-8966-7c8036a01871/vutegonifezuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f6f01d0-2fc0-4704-a71b-ce360c29a54c/tijor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff842d6a-f275-4fb3-9651-815611585355/9823167576.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9927 5440 bytes
SHA-256: 2304055d2528f2793fd2cea1f566623bb5d0c1647d7fe8d9ece3a4928d392cdf
font_01_sfnt_off0000ab70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB70 17204 bytes
SHA-256: 97978cccde56deb1169c7c3b41e11e4f02dd36e2db5f42bf834f76a81792dd82
font_02_sfnt_off0000e119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE119 16292 bytes
SHA-256: 0bf397e83b3d1943fc2d7fa701f1052d8619ffe33fd16bc08e2d9f01316b5faa

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