Malicious PDF — malware analysis report

Static analysis result for SHA-256 87238710cc6c96a9…

MALICIOUS

PDF

40.1 KB Created: 2020-08-13 17:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e4c9f3f3a847d11a923096526a684e44 SHA-1: c65ca7bdba98c8e462dffad11e48a727fdac14ec SHA-256: 87238710cc6c96a996b0769f195f4174d39a818b6b656161457bbc025183a58c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be a lure for free worksheets, likely leading to a phishing or malware download site. The ML classifier strongly indicated maliciousness, and the presence of redirector links supports a phishing or malicious content delivery attempt.

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/wb?keyword=unifix%20cubes%20worksheets%20free In PDF document text
    • http://files.heartlandarchery.ca/uploads/1/3/2/3/132302907/bubutoxitag.pdfIn PDF document text
    • http://fodala.agratefulnote.com/uploads/1/3/0/7/130738614/ketixuboxi_tasora.pdfIn PDF document text
    • http://files.natteyallockps.com/uploads/1/3/2/7/132740584/durukugol.pdfIn PDF document text
    • http://ritagogaw.laurenparker.com.au/uploads/1/3/1/6/131606289/86a7d340706.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/1/0437/0310/7752/files/livro_associativismo_e_cooperativismo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/anil_s_ghost_full_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64541570927.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2109/0471/files/konofedivumasatapus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9522/6523/files/gezesuxurad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/21073297356.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5286/6467/files/carencia_de_vitamina_k.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6661/4175/files/thinking_in_java_latest_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D64 5080 bytes
SHA-256: 9d35024421ef6286df4d7c418a6b298b783b03a01accb92b6ec7bad7e0cc0805
font_01_sfnt_off00006ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC0 10932 bytes
SHA-256: ef6914e651ac15f5934d05270bd88f0323b8348982695256f0679a5b6354d5cb

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