Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fc72521bf5917c…

MALICIOUS

PDF

39.5 KB Created: 2020-09-18 17:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9c0a49af75493d746eec308f9ac789ba SHA-1: 9898da86f0b91864c673c6f79eda2d7818a540a0 SHA-256: b4fc72521bf5917c149e114b36029a6b0aba11e7d846d92f5b626d47b84d1711
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure text referencing "Lewmar winch repair manual" and embeds a large number of links to external PDF files, many of which point to suspicious domains. One critical heuristic identified a PDF link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document's primary function appears to be acting as a link farm to distribute traffic to potentially malicious sites.

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://ttraff.link/wix?keyword=lewmar+winch+repair+manual In PDF document text
    • http://files.partyfavorband.com/uploads/1/3/1/3/131398479/1815732.pdfIn PDF document text
    • http://vimuwodu.swallowthesea.com/uploads/1/3/0/7/130775195/3ecbc4369e1.pdfIn PDF document text
    • http://pavolero.theenergyalignmentcoach.com/uploads/1/3/2/8/132814930/pigeji.pdfIn PDF document text
    • http://kusalad.richardeby.com/uploads/1/3/1/1/131164250/xatuxife-lenija-kikojefige-zuziwe.pdfIn PDF document text
    • http://japofege.sacred-seed.co.uk/uploads/1/3/2/8/132814343/wadamidiribu-xopixinomix-bukoxipew-mokamofegade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5eade90-e52c-4a05-bafb-3e1a426eb4ed.filesusr.com/ugd/0d018b_c38d49fdb59e4908b3eef708c09a1a81.pdf?index=trueIn PDF document text
    • https://a1762a50-146f-4696-a126-e32ee8d89274.filesusr.com/ugd/370021_2520ba0c64d547a59a2fc0c5c34c6df4.pdf?index=trueIn PDF document text
    • https://c667fedf-4409-4dde-9b04-97dcb98ba24d.filesusr.com/ugd/733c1f_d1acdae6dd5d48559beed3dca9728b0f.pdf?index=trueIn PDF document text
    • https://3ed332d6-3d58-4f4d-99b3-8afa47b8e543.filesusr.com/ugd/80bfa9_ebff5f473f384454944b308880d32ca5.pdf?index=trueIn PDF document text
    • https://3708007c-d5b4-4769-be1f-3dba6bc5888a.filesusr.com/ugd/6f58fb_18613b2b10d04640bb9806dbfc659707.pdf?index=trueIn PDF document text
    • https://30874e07-26f3-4f3c-a35d-253cbca8f980.filesusr.com/ugd/c162b3_1dcf3a842a2145b1b579de1f30445880.pdf?index=trueIn PDF document text
    • https://1f67c8cf-aa88-47b6-b819-00401d5a5acf.filesusr.com/ugd/bb13a2_d721e8af6d9149229e01817a8f279e2a.pdf?index=trueIn PDF document text
    • https://2c629fcd-1a52-4250-86f2-973d8373ddc7.filesusr.com/ugd/0d002d_4e53e521ca1c4b30a5d4d9a0a0950b02.pdf?index=trueIn 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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA2 5028 bytes
SHA-256: ece6e4b73646f40856c5e6f5ce71b4a73cc163ef5da3ef0cd5a366909ac25b2d
font_01_sfnt_off00006fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA1 9940 bytes
SHA-256: df482b5a0fc5dba5c7728f7f50e47cb4b57c23d10e4befec1646ec6276fbac8c

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