Malicious PDF — malware analysis report

Static analysis result for SHA-256 711243c1fa6647d4…

MALICIOUS

PDF

72.1 KB Created: 2020-12-28 21:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a2fb5dac16f9c3074633831148e8a05b SHA-1: 8786c78290977a55a192a72fff4161da418cc736 SHA-256: 711243c1fa6647d414ed7c787a1fc82d82cf9c9c0946cf7dcf714069c8ff3289
162 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://gettraff.ru/strik?utm_term=adventure+escape+mysteries+walkthrough+trapmaker+3'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a game walkthrough, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=adventure+escape+mysteries+walkthrough+trapmaker+3 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_5fa3c5a548e34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5fe99086b9deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f8a04dacc965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5fa58b1e280a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_5fdc190684a8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fe2539147cf1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/mosuvugovewomejam.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/solving_linear_equations_and_inequalities_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/excel_macros_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/asus_ac3100_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/pubg_weapons_damage_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48012a3e-b751-4558-ac1f-a9d6097d7292/kroger_blood_pressure_monitor_bp3aq1-1kro.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/forestry_applications_of_airborne_laser_scanning.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/56157681273.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/tecnica_de_recoleccion_de_informacion_entrevista.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 5956 bytes
SHA-256: cc61dc889929aaa9204d3c77fa558d12055b9b1a891cd9765843b1fa8ce39c47
font_01_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 10596 bytes
SHA-256: f96ceaf81a466f2e09c8eea42a42435e24a085c7fdc2354aeedcd1b1ea0d3875

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