Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c8b4d95212188d…

MALICIOUS

PDF

45.4 KB Created: 2020-08-24 09:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c8c5151aebcccba9a9e6d5a708e1b61d SHA-1: d5d5a2b949dd2c76bbad06a93871ebdab6529221 SHA-256: 71c8b4d95212188d54c74c611414573a58312e4d873730a7bdb59fb061a595c4
194 Risk Score

Malware Insights

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

The PDF contains embedded links and text that direct users to a malicious redirector URL, likely for phishing or malware delivery. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm designed to obscure the ultimate destination. No scripts were extracted, but the document body and heuristics point to a social engineering lure.

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=uco+english+education+degree+sheet In PDF document text
    • http://files.apayuq.com/uploads/1/3/1/4/131454172/bimuwubuj.pdfIn PDF document text
    • http://kuginokan.creativempartners.com/uploads/1/3/1/4/131455069/fd919d57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/40596821153.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3013/6230/files/league_of_angels_paradise_land_formation_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/bucket_elevator_chain.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/61167683931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/73754255539.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/wugawuruze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/57619045382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/2nd_conditional_in_reported_speech.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0378/1013/files/kapusuzujorowami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/94843685768.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/32472053507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/fexiwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/gun_shooter_game_apkpure.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6692 5072 bytes
SHA-256: 0641e48100ecb9ca549a313773f45019681ccd3a9133be48b7c085a2227d167a
font_01_sfnt_off000077bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77BB 10180 bytes
SHA-256: ae04cf3895d163ba4bda6eb06507a55ae35ca21bed3358281a09d3e6c2cb31bb
font_02_sfnt_off00009a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A6D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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