Malicious PDF — malware analysis report

Static analysis result for SHA-256 a865cfc738cc4d83…

MALICIOUS

PDF

49.6 KB Created: 2020-12-20 21:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a39acacb320d40c51fc8b0f99fac5d0 SHA-1: 0bdb5451f1042ca5d49b381234dc763632068851 SHA-256: a865cfc738cc4d8340af33c6609eae08dcaeec42402acc5ec43774447b4192d3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file is identified as malicious by multiple heuristics, including a critical finding of a link to known malicious redirector infrastructure. The document structure suggests an image-only lure, typical of phishing attempts designed to trick users into clicking embedded links. The primary IOC is the malicious URL used for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6064

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 49 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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/strik?utm_term=define+statistical+question
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5fa731db1e607.pdf
    • https://static.s123-cdn-static.com/uploads/4486742/normal_5fccdbc4cde85.pdf
    • https://static.s123-cdn-static.com/uploads/4366347/normal_5fc554cd740e8.pdf
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5f976e97d1cc2.pdf
    • https://nipifofopofeduv.weebly.com/uploads/1/3/4/3/134338269/8426725.pdf
    • https://static.s123-cdn-static.com/uploads/4423750/normal_5fce18f65940f.pdf
    • https://static.s123-cdn-static.com/uploads/4421036/normal_5fc47b32663c4.pdf
    • https://static.s123-cdn-static.com/uploads/4470542/normal_5fc79be36021f.pdf
    • https://cdn-cms.f-static.net/uploads/4465007/normal_5fbca35aad1a2.pdf
    • https://cdn-cms.f-static.net/uploads/4403684/normal_5fd2c61064f5e.pdf
    • https://static1.squarespace.com/static/5fc55cc72e34347c7062119a/t/5fc737a9788a962b7c2af9da/1606891436669/pong_video_game_for_sale.pdf

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