Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c37db627f52b4e…

MALICIOUS

PDF

43.6 KB Created: 2020-08-06 00:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 171ab290fb8af6d8cceb8da085019884 SHA-1: e173229886aea1bd62a67657900c8c80e641408b SHA-256: b8c37db627f52b4e71d6a4a4e67f7bfaa5ce8b7eb0bd16da1f8827ec9f07f4ba
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc). The primary heuristic firing indicates these links lead to known malicious infrastructure. The document body, though heavily obfuscated, contains a reference to 'beginner exercises pdf' and a URL that appears to be part of the link farm. The ML classifier strongly indicates 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.cc/pify?keyword=beginner+exercises+pdf In PDF document text
    • http://files.tracypowerconservation.com/uploads/1/3/0/9/130969260/jarufujo-tozag-balol-maves.pdfIn PDF document text
    • http://files.iwfgeorgia.org/uploads/1/3/1/4/131455883/dofez.pdfIn PDF document text
    • http://files.osteopathy-chronicpain.com/uploads/1/3/2/6/132683088/sesegexamusaxab_pisiz_bizovenibujob_todejupupuz.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/1/0430/4044/0471/files/60848632823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/18842246410.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3320/6690/files/kejironisugosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/29852977044.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/altiplano_cundiboyacense.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/72385627085.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/76372787385.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/32601116296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/xefisufavasemazikeku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/9461060883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lebalod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.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_off00006d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D43 5200 bytes
SHA-256: 34a4c8ec26c1878f0a91e7de4bc6d7babdc87f843ebbfa979748b9c316243b5f
font_01_sfnt_off00007f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F16 9992 bytes
SHA-256: ea21b80eaf58e3ece3d8bff2aa73daf624f1708529759a0ca398745fe16eab54

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