Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25394a1f263f1cb…

MALICIOUS

PDF

18.6 KB Created: 2020-10-26 06:29:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78bc9008f6e8c0125b12a6db2eb55046 SHA-1: 652a5169150c508eb9492aed058daf8d805e4d07 SHA-256: c25394a1f263f1cb4a93a55aeea90dd924ccc8868bc25a2388950499741e1d90
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as a guide to merging PDF files but containing a malicious redirector link. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document with an action trigger, typical of phishing attempts. The critical heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of a link to known malicious infrastructure at https://cctraff.ru/aws?keyword=comment+fusionner+plusieurs+pdf+en+1+seul, which is the primary IOC. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 3

  • 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.
  • 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 18 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://cctraff.ru/aws?keyword=comment+fusionner+plusieurs+pdf+en+1+seul
    • https://cdn.shopify.com/s/files/1/0495/9571/1651/files/taxagenibados.pdf
    • https://cdn.shopify.com/s/files/1/0498/0690/1405/files/22359141540.pdf

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