Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdffc1d3da19e96f…

MALICIOUS

PDF

66.7 KB Created: 2020-12-22 09:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffa10f53ef9ea74d776674a8f32bf1d2 SHA-1: 591e1076d3bd43aa81d18e6c0af7489e8d778b02 SHA-256: fdffc1d3da19e96fb1fdc9e0fde0082785e824303972eb751ea0e3401ef260f8
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'. The ML classifier also strongly indicates maliciousness. Although the document body is heavily obfuscated and unreadable, the presence of a malicious URL strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/strik?utm_term=ice+cream+near+me+that+delivers
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5fe0a92335153.pdf
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5fbe028d7ffaf.pdf
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5fa984506263b.pdf
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f87655f8d798.pdf
    • https://cdn-cms.f-static.net/uploads/4393349/normal_5f95f1b2472c2.pdf
    • https://cdn-cms.f-static.net/uploads/4480595/normal_5fb9f981adb36.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazifozixawus/54324923114.pdf
    • https://static1.squarespace.com/static/5fe138f08f5a4e4697186a44/t/5fe16174b356721fce2d4aab/1608606070364/muxosufuwiwurobitumufobin.pdf
    • https://static1.squarespace.com/static/5fce0ad649d01c20c203de03/t/5fd6dc5f491a58544a23b067/1607916640092/cdc_pneumonia_guidelines.pdf
    • https://static1.squarespace.com/static/5fc524a22e537a05ef248c5e/t/5fd0ebeb65d4c21e5f999d56/1607527404850/sodokitavopodiwexijov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a2.bin
1bf55ded25517fac74a68b2d08126c6d9b8a0d2c455d097aebe83d9d9fdd3322		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 5176 bytes
font_01_sfnt_off0000da14.bin
a38651adf2b8c938c7167ff42fc4ea7109fdb26c8262698b2fa3d4100bd5851e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 10540 bytes

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