Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3cff7c5a543876…

MALICIOUS

PDF

65.3 KB Created: 2020-11-11 15:30:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59afd1a2f734f1cd2fe71732a8cb18e8 SHA-1: 98dc342b906709067c41cd9712603bd77f95e503 SHA-256: 3e3cff7c5a543876266b7980c959c3a1df67bebe09f9bd524e890db7b82fa394
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=multiplying+monomial+worksheet+pdf'. This URL is the primary indicator of malicious intent, suggesting the document is used to redirect users to potentially harmful content. 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

  • 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=multiplying+monomial+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4425491/normal_5f98ee557a5f1.pdf
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5f88cb52729f0.pdf
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f879bd48b273.pdf
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fa6d8acd80a1.pdf
    • https://cdn-cms.f-static.net/uploads/4386837/normal_5f936087dbec5.pdf
    • https://cdn-cms.f-static.net/uploads/4368224/normal_5f9c989e872a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tipakalif/jogixuzuxituvafaf.pdf
    • https://s3.amazonaws.com/busutafitufe/lajinolizonese.pdf
    • https://s3.amazonaws.com/bubisifapagefe/nonujunuwo.pdf
    • https://s3.amazonaws.com/dukexajuj/phantom_of_the_opera_movie_cast_2004.pdf
    • https://s3.amazonaws.com/fulosobezur/6901826134.pdf
    • https://uploads.strikinglycdn.com/files/c9b8e2d7-83a0-4ad6-84cf-8fa1a2127c00/caracteristicas_del_seminario.pdf
    • https://s3.amazonaws.com/zerepuzuze/sam_flynn_dad.pdf
    • https://uploads.strikinglycdn.com/files/10de4eff-4f6b-45a9-b602-9c43a8de75b2/vonug.pdf
    • https://s3.amazonaws.com/tagorarib/coc_gem_hack_no_verification.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_off0000c219.bin
29b1e856721a448bde7674653019f1d1938687dfa0b2c0f0c0a17858573739a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC219 5716 bytes
font_01_sfnt_off0000d586.bin
1a565009d98dd378f7d90268996bdd7f694360e51943c5f2211f95338c40dcf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 10224 bytes