Malicious PDF — malware analysis report

Static analysis result for SHA-256 c231a51c0ac8f803…

MALICIOUS

PDF

62.4 KB Created: 2020-08-12 14:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cde986cb254689b97262b8beaf3b3df0 SHA-1: b3037ad0098d2b7dc3b3e1fcceeccd47d6085c4f SHA-256: c231a51c0ac8f8031f2806a34f3f49c1a620b4017f4a70260037a1ee9754fe1b
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, masquerading as a document about 'bronchiolitis obliterans'. One of these links, 'https://ttraff.ru/pify?keyword=bronchiolitis+obliterans+pdf', is identified as a malicious redirector. The ML classifier strongly indicates malicious intent, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious 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.ru/pify?keyword=bronchiolitis+obliterans+pdf In PDF document text
    • http://files.realhelpconsulting.com/uploads/1/3/2/8/132814791/jomapa.pdfIn PDF document text
    • http://files.lalarukhgroupofhouseboats.com/uploads/1/3/2/6/132681351/jorapafiseniwugidika.pdfIn PDF document text
    • http://files.myoptique2020.com/uploads/1/3/2/6/132695741/zudug.pdfIn PDF document text
    • http://dokewedoz.sal-elsayed.com/uploads/1/3/2/7/132710621/9a1dc5a4603937e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9415/5170/files/left_view_of_binary_tree.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6159/8616/files/financial_spread_betting_for_dummies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/8817917613.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3277/2757/files/70569181007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/dofefebawemejemidogux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/8895292979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7102/0964/files/94095697312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8729/7696/files/9493094050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/soruxoremoxavul.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 4

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1DF 5220 bytes
SHA-256: ebdb88ccf2d0c9f77e565087ecde5ac63cf9469cfd2c3eba0d4531e133bbd082
font_01_sfnt_off0000b37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37C 13568 bytes
SHA-256: 54802b4f4884f4d83fbb12b4810be7d85c1ca645d44d60d46a20cd692263aa71
font_02_sfnt_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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