Malicious PDF — malware analysis report

Static analysis result for SHA-256 31128687841756a3…

MALICIOUS

PDF

40.9 KB Created: 2020-08-03 18:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b77dcd7406a0232e77e6711102a1246c SHA-1: 43bd5472f51793990936d6d1da88d94e4b317458 SHA-256: 31128687841756a320118d66b8e28d808d19d391af2479c51d3c7a8894c2a4f8
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an ACCA syllabus. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL leads to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic suggests the document is part of a link farm, likely to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of the file.

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=acca+f6+syllabus+2020+pdf In PDF document text
    • http://ranunir.swcfcu.org/uploads/1/3/0/7/130776088/lixilijibo.pdfIn PDF document text
    • http://files.assembly2237.kofc.com/uploads/1/3/1/4/131437886/buremowaj-xojedef.pdfIn PDF document text
    • http://files.thebescourthouse.com/uploads/1/3/0/7/130738531/17335a8f52593.pdfIn PDF document text
    • http://files.rebalancesudbury.com/uploads/1/3/2/6/132681392/potokozobajinopabov.pdfIn PDF document text
    • http://files.littlebittaluckfarms.com/uploads/1/3/1/4/131483002/2477570.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/1/0448/5015/1584/files/masterbuilt_smoked_turkey.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0843/4081/files/mixufubux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/nodagesexadinojovizasapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2334/2495/files/timokomexow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/54737578550.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9822/5320/files/73908142810.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/67565542808.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9430/9019/files/verizon_smart_rewards_auctions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/85603843744.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/bebubefugudotuzufen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/c_binary_search.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 7

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_off00005fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEF 5712 bytes
SHA-256: 4d32d169bc4a94a028e7b5f52ec1f4d616398dd57f58d39d136ea28aa57a1b6a
font_01_sfnt_off00007382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 10432 bytes
SHA-256: a78fcdf61cfadfbef394cdac825af85ca98f96cac138556f30e06edb48f0a01b

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