Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ecf3699b41f4a7…

MALICIOUS

PDF

66.7 KB Created: 2020-11-13 01:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6282f4ae7b1fe28e1768f8f13e5ce302 SHA-1: 0781b39a2c53dd6dfab9b346153e352131d56b39 SHA-256: 19ecf3699b41f4a79c2e0706b3bcc3e6f83de9a3a9ea1abc89f0e3f031cb7afd
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=klipsch+r+4b'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gettraff.ru/strik?utm_term=klipsch+r+4b In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5f8a94ba7bf23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f89ecca4dfda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5fa87155c5855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f9fe5063312c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f99afc9e3545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_5f9c3b1fa4a98.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/sugaguxagu/escalation_protocol_armor_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/71845573738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77876160-ccbb-488f-bf74-eb51e605b614/inside_the_java_virtual_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/skype_guide_user_manual.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_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 5008 bytes
SHA-256: 9ee743a2a7c1a3255c18a10ac27c94895cb5c19a28885a2938764d556457f2a7
font_01_sfnt_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 10508 bytes
SHA-256: 4e5edd67864ff4ee8b30127dbdaf070717149d1e51781d6dbbcae4393486ee59

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