Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcd26103ef700bc…

MALICIOUS

PDF

73.4 KB Created: 2020-11-30 03:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bfed948def07a7dd923e85446393dd2 SHA-1: b3c78e4a1432b0e9bd06369e2b87fe09845fcc3e SHA-256: 6bcd26103ef700bc333e16a1f48235c10a6e098637643022c36ae6a00c36f273
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 'https://gettraff.ru/strik?utm_term=rubaiyat+of+omar+khayyam+english+pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/strik?utm_term=rubaiyat+of+omar+khayyam+english+pdf
    • https://cdn-cms.f-static.net/uploads/4420760/normal_5f973b83aaed4.pdf
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5fa03efd80020.pdf
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5fb94837abbd5.pdf
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/6436302.pdf
    • https://gukegibulu.weebly.com/uploads/1/3/4/6/134668459/3ec4dba526391a.pdf
    • https://cdn-cms.f-static.net/uploads/4491148/normal_5fbf9a4949fd4.pdf
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f8e45971395a.pdf
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f97a7ad5d4b6.pdf
    • https://mamotuzukaw.weebly.com/uploads/1/3/4/4/134438076/gowixomugetoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rezugekolaba/mystic_branch_witchery_mod.pdf
    • https://uploads.strikinglycdn.com/files/052a1713-246b-4f6a-841b-a4e98d24799d/thing_thing_classic_arena.pdf
    • https://s3.amazonaws.com/bitizopovopaso/5749373243.pdf
    • https://s3.amazonaws.com/dinisemowoge/nowibaz.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_off0000e2b5.bin
7fb520ee621bf57226465ec7fe37b8c8d6bd2d752079ed3548c266e90d8e09e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 5768 bytes
font_01_sfnt_off0000f640.bin
e773c895265a6d3a1cc9ed155b06e3f9c4de202566bfec44607634041cfcaf1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10128 bytes