Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b04fa8e8587067e…

MALICIOUS

PDF

26.0 KB Created: 2020-10-03 10:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5026ad8f5260634a5108a2589d4161fd SHA-1: f3fd774997f9fb4309027d6af8e5bdb7b503836c SHA-256: 5b04fa8e8587067e4a90f17366f2f358358fed527d81cfc40b7733a8bd0d2026
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous links to external PDF documents hosted on various domains. One of the embedded URLs, 'https://cctraff.ru/strik?keyword=7+habitos+de+la+gente+altamente+efec', has been identified as a malicious redirector. The ML classifier strongly indicates malicious intent, and the structure suggests a tactic to distribute malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?keyword=7+habitos+de+la+gente+altamente+efec In PDF document text
    • http://files.codeofwords.com/uploads/1/3/0/8/130814680/sojemebirivobagi.pdfIn PDF document text
    • http://waxuregun.besttoyou.net/uploads/1/3/2/6/132695675/ae963ec1a.pdfIn PDF document text
    • http://files.jamesrcloyescpa.com/uploads/1/3/1/4/131453132/db3a67de37da.pdfIn PDF document text
    • http://files.kennymackay.com/uploads/1/3/0/7/130740496/zexugizaxeg.pdfIn PDF document text
    • http://gekipiru.3rdspacecc.org/uploads/1/3/1/1/131164077/4292174.pdfIn PDF document text
    • http://files.stellarhealingsc.com/uploads/1/3/0/7/130739740/numev.pdfIn PDF document text
    • http://files.geekygiftbaskets.com/uploads/1/3/1/4/131453294/5172596.pdfIn PDF document text
    • https://site-1037840.mozfiles.com/files/1037840/91603565238.pdfIn PDF document text
    • https://site-1038974.mozfiles.com/files/1038974/gezaneno.pdfIn PDF document text
    • https://site-1039645.mozfiles.com/files/1039645/simog.pdfIn PDF document text
    • https://site-1037164.mozfiles.com/files/1037164/vipepapiribamedup.pdfIn PDF document text
    • https://site-1039878.mozfiles.com/files/1039878/fatesojot.pdfIn PDF document text
    • https://site-1036786.mozfiles.com/files/1036786/18415267999.pdfIn PDF document text
    • https://site-1037900.mozfiles.com/files/1037900/57534919007.pdfIn PDF document text

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