Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd70692e81b51ed6…

MALICIOUS

PDF

58.8 KB Created: 2020-11-29 07:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8a6a89b43216cd88aeb09b396d7dddd8 SHA-1: db356848d77f48b92c59c42685b7cb207ee0ef19 SHA-256: bd70692e81b51ed6f4a1f37cb25b74e913cb846a7afb844536fe46bba4d1a4bd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://traffine.ru/strik?utm_term=tahoe+forum+for+sale'. The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'Tahoe forum for sale'. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be directing the user to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/strik?utm_term=tahoe+forum+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f9403b358e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5faf2eba522e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5fa0eeb3e5c58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f8da31c1f51b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_5fa7eec3be2c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5f968c1c1871c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f9e0f5faf35f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f87d89ddaf76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_5f9ca644d0869.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/tudawufed/belejinow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203608bb-5a5d-4393-abf6-54d6d31a114a/kijuwedowubuzeleginuweja.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/csep_guidelines_for_pregnancy.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_off0000aa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA70 4956 bytes
SHA-256: 5e605db35a27ee3e8f839fd277965ad5137728071bd1239e158549b240f8049e
font_01_sfnt_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 10416 bytes
SHA-256: 6de6e0ac7f734a6caab474c4180edb7b904472f49a289c9919833d8f5230740c

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