Malicious PDF — malware analysis report

Static analysis result for SHA-256 912fbcd8ab7dc76a…

MALICIOUS

PDF

57.8 KB Created: 2020-11-01 06:27:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3800caf7d6f9ad43ae2dea4ed8caba27 SHA-1: d8e92205ec3d31cbfce701bf008bd97b313c153e SHA-256: 912fbcd8ab7dc76af3ac48e0e589f11e0512d5ffa51e3276fb336aaf6f025069
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=courage+to+tell+a+lie+original In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418791/normal_5f96344c5b4b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5f98ffed1b80f.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/663f7b7b1d3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f8725f8ed5a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f946799622c3.pdfIn PDF document text
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/lurazivupulezazaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43eca261-6d4c-49f9-b35e-85f3543aa263/68194862641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/xd_gale_of_darkness_walkthrough.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8924/7399/files/pubokorokawenolanel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3669/3429/files/san_luis_obispo_california_airport_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1109/9800/files/10806296343.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/9868/2537/files/realidades_2_capitulo_4b_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5138/2462/files/11158010521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/zisogileludededo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2911/4275/files/rolukusefan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efbd1aca-fae0-4f4f-bd2b-f7e119ab02ef/rahu_beej_mantra.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ad3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAD3B 26192 bytes
SHA-256: 95538c8996b02c434a2e1f8070de8703d4c7e7119c6e3d9c337e64acdcedf5aa
font_00_sfnt_off000077ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77BA 4580 bytes
SHA-256: 01f258463441f9130b1be6cb074ca1ff26c9e5dbd1f85465eaa9dd92d06df219
font_01_sfnt_off00008755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8755 11144 bytes
SHA-256: f49780d15ecd7f6288741ab372d0a4d09b854bc87046b54c65bc4ca92551f7fb

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