Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb8e5618e7af42f…

MALICIOUS

PDF

39.7 KB Created: 2020-09-14 13:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2b7d9984cb07f9040c46e13f1ae328cb SHA-1: e4bb8d39ceddd80266f826d36a5cd2f566a6af0f SHA-256: 3cb8e5618e7af42f47eedcfb99ede7c546198f0c716902669a5dbe8d31f6c2e1
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are likely part of a link farm designed for SEO manipulation. One critical heuristic firing indicates a direct link to a known malicious redirector. The document body, though partially corrupted, contains text related to 'rocks and minerals online field guide' and the malicious URL, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the primary attack vector appears to be social engineering through deceptive links.

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/pify?keyword=rocks+and+minerals+online+field+guide In PDF document text
    • http://wibop.thunderheadstudios.com/uploads/1/3/1/8/131857114/mizibiwajiki-fasujopudilo-tuxutox-fajexe.pdfIn PDF document text
    • http://files.mattstevensultra.com/uploads/1/3/2/7/132710491/favut.pdfIn PDF document text
    • http://files.robertwilliamwhitby.com/uploads/1/3/2/6/132682892/rugoriw.pdfIn PDF document text
    • http://files.risk-and-resilience.co.uk/uploads/1/3/1/6/131637021/2912399.pdfIn PDF document text
    • http://files.jamesawatsonjr.net/uploads/1/3/1/8/131856186/janonu-jibogami.pdfIn PDF document text
    • http://files.myececlass-growth.com/uploads/1/3/1/4/131408100/taselovizisuz.pdfIn PDF document text
    • http://memasixo.aussales.net/uploads/1/3/1/4/131453674/situsu_rilenomozogid.pdfIn PDF document text
    • http://files.hantsshortmat.co.uk/uploads/1/3/2/6/132682655/2160567.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/1/0465/3691/7151/files/weight_training_workout_log_sheet.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ce77c6_4e4a460cacd2466ab07cfa3219ce5a2d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/baa514_85250f64f4934a03a6574c95385eb7c2.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

Related samples 8

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_off00005d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D94 5412 bytes
SHA-256: 32cbc6bd80591cd6da754febe7e9606f3cb32636f016ed7ae06f7f63309192bf
font_01_sfnt_off00006ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF2 10060 bytes
SHA-256: 6dbbb780cad671afc6c03b786a1785ce96898c41fea9abc1f760ce6df767d21b

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