Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80b2670b4425c2b…

MALICIOUS

PDF

68.7 KB Created: 2020-11-26 07:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6cd1c879ba5766030ce6136b6d55843a SHA-1: 24bd80ba737897d8a02d53b17cc4920aef750d6a SHA-256: a80b2670b4425c2b0e6ff40e76b6acce54d4aa998072fbc5c38d30dc58762826
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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://cctraff.ru/strik'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL indicates an attempt to lure the user to a harmful site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?utm_term=manually+turn+off+bose+soundsport+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f872025859ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_5fa373ba291c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f87d388f2874.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://s3.amazonaws.com/mibiwivanetuj/steve_huston_figure_drawing.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/branching_process_in_stochastic.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/construction_site_monitoring_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/72899487392.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/king_crimson_jojo_sfx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90b4d62-890e-492b-93d6-0e171c2cf368/86135259038.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/wilisufakepalijunisowota.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/naval_architecture_calculations.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/4973518682.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/10988246905.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/witovirofufizozode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36a46eb-cb39-4f49-b681-c74eb184de31/77597366190.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/luvevase.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_off0000c357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC357 5116 bytes
SHA-256: 4d0e40db8fca39de13ecc9270fc12bafa1f93c9147a7308c03383e85b22ebb75
font_01_sfnt_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 10032 bytes
SHA-256: 159d8863b2738ba7c8f791123e410d084eb89c2604dc8a422808c0f98a5ee785
font_02_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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