Malicious PDF — malware analysis report

Static analysis result for SHA-256 3135a174efc806fb…

MALICIOUS

PDF

39.1 KB Created: 2020-08-07 23:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: da1f3478c65e4755782458f6919e29af SHA-1: 5e9dc95e353d121ebe9ba41ac9ed2ca9ac734424 SHA-256: 3135a174efc806fb96b9e1e37e8d5bb00588d0765e3ea2368675dc77c693b526
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to 'ttraff.cc'. The document body, though partially garbled, suggests a lure related to 'Allen test paper pdf 2020'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=allen+test+paper+pdf+2020 In PDF document text
    • http://jepimu.charleslubin.com/uploads/1/3/2/7/132712109/zimelewibikeleb_lekiz.pdfIn PDF document text
    • http://duwudosej.ipmed.org/uploads/1/3/1/4/131406717/8510b63c2cedde.pdfIn PDF document text
    • http://files.nourishmeantshop.com/uploads/1/3/1/3/131379012/gakegokenoxag.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/1/0434/0174/0439/files/negevibitaxuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0684/4315/files/punuwexepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/50977601865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/antibiotic_guidelines_johns_hopkins_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/kenojikepafaditov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/83653295199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/xefadodinidopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3450/1535/files/76183770468.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/pasavobomufodatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/23363365398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/59458520141.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 3

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_off00005be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE7 5296 bytes
SHA-256: ca69ecb5c6960479987ecb69e4360e6f98b90100bf40568f2d72ac1396d4f8c3
font_01_sfnt_off00006dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFA 9996 bytes
SHA-256: c04b90fa6caea344f7eba86e7760509d043e2defa570f2c8f91501c3957f22f7

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