Malicious PDF — malware analysis report

Static analysis result for SHA-256 431fb7bc1bd4b59e…

MALICIOUS

PDF

70.1 KB Created: 2021-01-10 18:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ffa2a9c7087a3201cbcae7db31bc6def SHA-1: d7ee491a7b841e54965abfa268df5c2e83e0e1fc SHA-256: 431fb7bc1bd4b59e80f2b1b9906b8b5ec3af1aafc2e1ae18627d0edd14901bb6
244 Risk Score

Malware Insights

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

This PDF document contains a large number of links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The primary redirector URL is 'https://traffmen.ru/123?utm_term=astro+a40+mixamp+pro+tr+xbox+one', which is flagged as malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?utm_term=astro+a40+mixamp+pro+tr+xbox+one In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f9aa9e296696.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/dZQjegf/pejikefavij.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/higgjhg/79258215703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491705/normal_5fdf540a8921b.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/bead49.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/6270435.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/rolifokujetuza.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/4d19e.pdfIn PDF document text
    • https://lanujedajifita.weebly.com/uploads/1/3/1/3/131382078/14e475059709b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_5fb5a7fd44ff9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5ff717b25b520.pdfIn PDF document text
    • https://cdn.sqhk.co/sazobenapur/hfijW4p/roninodadu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/71398805856.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 5360 bytes
SHA-256: e06b995cc3261770c9ce4681477ef875c160e6ee3da90bd9ab01043973f04f94
font_01_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 12080 bytes
SHA-256: d6ee328389c398d0cf33d52992c090c9f6aaf74fe805b6e909a5d2b4eb48e4be

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