Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc2fd08fa1364f7…

MALICIOUS

PDF

71.8 KB Created: 2020-12-13 21:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8f7058e2e24f881bd8800b9e96a4124e SHA-1: 4d28fb4284664faeb635dba4fc90cca4bb6eb9bb SHA-256: afc2fd08fa1364f78863a0ec3b63898ced64f009adc1af1e0fb89ce89d6f72d1
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, with the primary URL being traffset.ru, suggesting a link farm or SEO spam campaign. The document body is heavily obfuscated, but the presence of external links and the PDF_SEO_LINK_FARM heuristic indicate a malicious intent to redirect users. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/strik?utm_term=bissell+proheat+pet+2x+manual PDF link annotation
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/db5e5.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/4810833.pdfIn PDF document text
    • https://wumotobu.weebly.com/uploads/1/3/4/3/134370577/wuwilogadexojan-lolinenijulote-lovarasidew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5f9e827448762.pdfIn PDF document text
    • https://vepaxanejabag.weebly.com/uploads/1/3/4/3/134317352/figipimunu.pdfIn PDF document text
    • https://kapebuzuzevasa.weebly.com/uploads/1/3/4/5/134587117/5845743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5b413ff13940aa260656e/t/5fd1441a13fdce15e7be4f51/1607549979301/7137521214.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe22162dd96f5918b769ba/1606296088630/raw_umber_color_swatch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aad213ea-b253-4d5d-b30a-7a3f9b807346/29407088301.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dbcbbf71053ccb0ffb78/t/5fc319e73c6ccf69f3c46408/1606621673123/71832563655.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc553500b6b03258f52b7d8/t/5fc6aa39173fb5383b8fcd40/1606855226531/nilamovimu.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/99082360638.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/zodolatiterewujoburixadew.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 5308 bytes
SHA-256: 2ecf253628cdb7be4111b095fd679724893ae112eaee1815a3c23e79a46234d6
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 10904 bytes
SHA-256: 0dde84a270dc5b9a277fdbe7a213a359683cf3f53eb929456c8f91025033c5dc

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