Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacfac7fb89aaddf…

MALICIOUS

PDF

70.9 KB Created: 2020-12-30 12:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f453bd5a8ef8ade474b646e65a02d406 SHA-1: d0ed7730eafeb7b38ade9b8de0986088ca4b4f1a SHA-256: dacfac7fb89aaddf3d109efd7341bd204b7939980502ebfdbe536c5a537e5dfb
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://traffmen.ru/strik?utm_term=ludo+classic+apk+2018'. ML classification and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary attack pattern involves luring the user to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=ludo+classic+apk+2018
    • https://static.s123-cdn-static.com/uploads/4387703/normal_5fe2389a6d784.pdf
    • https://cdn.sqhk.co/retirijozi/zgd7ica/tigunozudabari.pdf
    • https://cdn-cms.f-static.net/uploads/4464303/normal_5fd7c11ba3e64.pdf
    • https://cdn.sqhk.co/lawafopugu/gghbThb/zekigodexunasusimafumar.pdf
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fd61b8e2aad4.pdf
    • https://static.s123-cdn-static.com/uploads/4487631/normal_5fe02b0bf1249.pdf
    • https://cdn.sqhk.co/vufisolepu/ehaiBay/49538897991.pdf
    • https://static.s123-cdn-static.com/uploads/4464056/normal_5fcfaaebdb661.pdf
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f8b839e0d107.pdf
    • https://cdn.sqhk.co/lafugafeniki/iF3hj5d/smart_balance_butter_vegan.pdf
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f91e0d21fd16.pdf
    • https://cdn-cms.f-static.net/uploads/4456132/normal_5fbf17f03160b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/6c8f2d02-e975-492e-81fb-f560c15cf524/eden_christian_academy_berkeley_hills.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca19.bin
9b113cdd32e087b136dc01ddc0106d9a14164c7ae49235fe3b68604f29a5ed6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 5072 bytes
font_01_sfnt_off0000db55.bin
502ef2939ff7f7178634ef3c8eae70e86f7fea7ac5f8dd881390f635e4c2427a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 11036 bytes
font_02_sfnt_off000100e6.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 4324 bytes