Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37c8a8fb2127a72…

MALICIOUS

PDF

39.9 KB Created: 2020-08-01 07:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 302b11618b970ce360a23bd3d7c1bf15 SHA-1: e34382840764c606f5b3ec07729939ba9b49c130 SHA-256: b37c8a8fb2127a723ef7fe4eb2f6017c175a07c88a0e675034da15ea5ea53e61
194 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, appears to contain text related to a calculus textbook, suggesting a lure to trick users into clicking the malicious link. The presence of numerous other PDF links further indicates a link farm or redirection strategy.

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.com/pify?keyword=james+stewart+8th+edition+calculus+pdf In PDF document text
    • http://files.hawgflatts.com/uploads/1/3/2/6/132696263/dc9957d83bd72f.pdfIn PDF document text
    • http://files.solidrockinternationalschoolofministries.com/uploads/1/3/1/4/131438234/4449334.pdfIn PDF document text
    • http://files.aitmission.org/uploads/1/3/0/8/130813524/5704187.pdfIn PDF document text
    • http://files.nowallsneeded.org/uploads/1/3/0/7/130776661/kumovotadinosoj-nufopuxotovor-foxaz-jasireke.pdfIn PDF document text
    • http://files.eaststreetartsnh.org/uploads/1/3/1/0/131071041/kidefij.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/1/0431/4444/6118/files/37848660369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6427/9718/files/vusonudepidugudamoniv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/15528808004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7318/3637/files/salimuvedepadomufitoli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/bufonu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/67020242407.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0291/2158/files/how_to_block_people_on_discord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/46764314557.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0527/0427/files/61322213109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonexosorovofevovu.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 6

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_off00005670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5670 5672 bytes
SHA-256: 54d7855786e8ef0bea42c425e9c78fa67103b9bbbfefe95a1cd126b2fa461013
font_01_sfnt_off000069ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69AE 12840 bytes
SHA-256: 16d31562a56a7826333a5693b7c4875cfcc6761353cfbd57d422b83518247a3b

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