Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2635eca83e0be36…

MALICIOUS

PDF

52.5 KB Created: 2020-08-02 17:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5621017fbf1610d01ca9606915d76874 SHA-1: 50baf4147508a8cf3ba5552269c90d82ea6205ff SHA-256: e2635eca83e0be364cb65d365d84df4621d47ca866f374548b452f621de55f9e
194 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDF files, with one primary link leading to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Three skeleton key pdf' and references 'wkhtmltopdf', suggesting a lure document. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a malicious redirector, and PDF_SEO_LINK_FARM indicates a large number of external links designed to appear as legitimate content.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.com/pify?keyword=three+skeleton+key+pdf In PDF document text
    • http://files.beitnachum.org/uploads/1/3/1/4/131483253/ximegigojepirez_rabisosip_suwupisi.pdfIn PDF document text
    • http://files.spaceschool.ca/uploads/1/3/0/8/130813859/93af91a.pdfIn PDF document text
    • http://files.lonepinelogandtimber.com/uploads/1/3/0/8/130813317/tojefajati_zenovilufer_dononodun.pdfIn PDF document text
    • http://files.wellwednesday.ca/uploads/1/3/0/7/130775528/b01586067b8c.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/1/0433/0687/7080/files/72438278193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8494/7357/files/69911085900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8924/8924/files/36718077749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1527/2605/files/78657751251.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/dijasejusevif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niborenegukudokeregus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1204107997.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/nagisusoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/rofaforesi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32773531818.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/91352817327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/14539676700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3120/5787/files/occupational_therapy_in_acute_care_pdf.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_off000091c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91C0 5032 bytes
SHA-256: 500f3f628dd14df19ec3e060582e021d0813d87bb50db8ef83ac274508b1b3bc
font_01_sfnt_off0000a2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2E5 10120 bytes
SHA-256: cdccd566a28aca0e2253331bc8da768cd9953ecc45ceef1e83e4321158fa7c3f

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