Malicious PDF — malware analysis report

Static analysis result for SHA-256 60bc81a5cbf4cfac…

MALICIOUS

PDF

68.9 KB Created: 2020-11-26 10:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a78bf1903732a12b02233986f5da959d SHA-1: 98f6aa1bb060956ad3ea8e30aec0e264e82a7af8 SHA-256: 60bc81a5cbf4cfac57753a6c7ad60fe72f542c34e7c7a9727d22353ebcfda464
194 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 flagged this PDF as malicious. The presence of a password-protected archive lure suggests an attempt to bypass gateway security by encrypting the actual payload. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=bullet+bill+game+passwords In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_5fb8afdf61894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_5fbc42c4980d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466689/normal_5fad9058a712a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f7790711-0c8c-48f8-ad0e-71190f08cac7/62011441403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61f8952-7c10-49c8-abe4-d028b1cc34ca/zerefisusulapibixota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e5fe77-8e3b-4b01-a57a-ed94a77961ed/ffx_2_petrify_grenade.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/makajogotarubewele.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/bishop_gunn_natchez_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/burris_pepr_installation_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8eac617-38f4-42bb-9d82-d48fbb0482bd/97612601404.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF1 5336 bytes
SHA-256: 7459dac6e9bdad86efd2f28605912277a7d69a2ce440b87cf06373b0df8dee32
font_01_sfnt_off0000d02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 14848 bytes
SHA-256: 04a9ddcaf8ab48fd5dec61a14f27f53d4e474d962cbbd3efcc52a9feea28d7a3
font_02_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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