Malicious PDF — malware analysis report

Static analysis result for SHA-256 2143c1dc87b31fba…

MALICIOUS

PDF

40.0 KB Created: 2020-08-31 11:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f9e94ca6e4f0505a2c59c42fce19ea11 SHA-1: 38c13b834602859fd4b746e337660badd35d5740 SHA-256: 2143c1dc87b31fbad257079c0c7f8be1a20986e4da240e90670ea7b263792f23
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and heuristics indicating it is a redirector link and part of a link farm. The document contains numerous embedded URLs pointing to PDF files hosted on Shopify and other platforms, suggesting a tactic to inflate search engine rankings or distribute further malicious content. The primary malicious URL identified is https://ttraff.ru/wix?keyword=balancing+chemical+equations+answers.

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/wix?keyword=balancing+chemical+equations+answers In 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/1/0427/5752/1574/files/32902468244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0299/4586/files/undo_a_push_to_master.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2001/6021/files/31650853463.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9003/5366/files/wewegazemuxitefununinuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2174/3781/files/fukemu.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4117a9_caf497483c024088b8f5c7a103966a83.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_9b4fa15f367d472ebee897d0549728ed.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_790dd339d1a04b8fb4af639928740fc0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_462a32b997ce4dbf8f8589a801444202.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4ae4db_4e48bda8626d461dbc059b3b5a24eb7f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_67e7acd4ca64447d8afb699521dc813a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4ae4db_f75659c31dfc40608e6b5544435fa96f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a292157288c34cb6a8fde7ba316f5abb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5cf23b_130fe229f9bb46c8971d8b6d4466f06c.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 1

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_off00005ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA0 5480 bytes
SHA-256: 4bcc4017fdc880f547845754e9f3e215c1291813beb0609a29b521036df17594
font_01_sfnt_off0000711e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711E 9940 bytes
SHA-256: 2dcae7243761f6f5dc8ceb8c90f271c3e01d0420d94878d584e7d04cb8032114

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