Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a931c931365d08d…

MALICIOUS

PDF

33.7 KB Created: 2020-08-12 09:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e005647eb2fb78519b5fb3223ed5849e SHA-1: 27efdb0104047ca16bc35c96adb37c6413c992f3 SHA-256: 9a931c931365d08d99ba3cafe04e065c7689e49e452988935b516161bc39ff96
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body text, though partially corrupted, includes the phrase 'Tom myers anatomy trains pdf' and references wkhtmltopdf, suggesting a lure to disguise malicious redirection or SEO spam. The ML classifier strongly indicated maliciousness.

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.ru/pify?keyword=tom+myers+anatomy+trains+pdf In PDF document text
    • http://files.maryvillekiwanis.org/uploads/1/3/2/3/132303339/9744444.pdfIn PDF document text
    • http://files.olgaflamenco.com/uploads/1/3/0/7/130740524/baromixagiz_saritebilorizo_zinijep.pdfIn PDF document text
    • http://files.efmracing.com/uploads/1/3/1/3/131383943/tirakavonu-gopefomonidimij-fotedamojulo-posugazizajap.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/1/0432/0778/6654/files/xasopotok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5463/5937/files/96677386884.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/gunaxinivoluwabuxefuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9801/1816/files/zonodiwuvoradunolapugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/damodarastakam_in_bengali.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9087/8372/files/xowon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8462/5558/files/tutekuritujodobinuke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0496/0676/files/buzalubazofamaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/bekozigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3856/2712/files/63992139138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/87657919960.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_off000045e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45E0 5208 bytes
SHA-256: 45601138ae8450617e25262f6f6eac8fc0e135cc033d509efc1853181e0e743b
font_01_sfnt_off00005787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5787 10116 bytes
SHA-256: d46ca85ad93314feaf24ae40c8f9b52b41ce683599db6efad579557bcdb7972e

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