Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff7a99775098089…

MALICIOUS

PDF

77.8 KB Created: 2021-01-15 13:02:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d8fdc8849aa524ffb485883f7ab07db1 SHA-1: d8c5df5a4fddd271a3230e2da7434dd3db8fff95 SHA-256: 3ff7a99775098089bf58a0efac4d7316458cf2e474fbad6d804a72af99aa1da1
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffmen.ru'. This URL is presented in the document body, suggesting a phishing or scam attempt to lure users to malicious infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=dnd+5e+whip+homebrew In PDF document text
    • https://static.s123-cdn-static.com/uploads/4407086/normal_5ffbf296ca4df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_5fa7d3060cfc2.pdfIn PDF document text
    • https://site-1197344.mozfiles.com/files/1197344/fusizimunepid.pdfIn PDF document text
    • https://site-1172329.mozfiles.com/files/1172329/fawiwufedilajekijefas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5f9e5eb8b8063.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/equalizer_audio_pc_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5ff57582b3815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5fbf5bcba2bf6.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/6hj0CF9/strikers_1945_world_war_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_5fb82cdd810a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421217/normal_5ff994d2b5276.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://s3.amazonaws.com/widiku/autocad_2013_keygen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 4840 bytes
SHA-256: fff65903c8f500984508e4a418a02d9acfc981d337bfa951e386b83df889898f
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 10980 bytes
SHA-256: 2fd196a28660d90234c5adff2e8a23e9d32ba02fbc143e1fdf22e06b6c80e5f8
font_02_sfnt_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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