Malicious PDF — malware analysis report

Static analysis result for SHA-256 a581d3f4ce6e4998…

MALICIOUS

PDF

72.3 KB Created: 2021-01-08 06:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e27b1b830de4ab0514614146ae9415c5 SHA-1: 8c00887ecb60ca90c1ac6ad53fd54e7149d19a23 SHA-256: a581d3f4ce6e4998448f1be82d8919037a03ca14b2c532fa384b3a7458cef07d
162 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 'gettraff.ru'. This, combined with ML classification and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The embedded URL is likely intended to lead the user to a malicious site, potentially for credential harvesting or further payload delivery.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=reading+a+standard+ruler+worksheet+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5fec7e73456d2.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/hg6Yvnu/30084885504.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/jezekemunidup/78333542967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c3617d-07e3-46e4-905d-a7b908cb402c/liguwofeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764fdcc3-f3cb-4691-826f-138fef6d6df6/boragiw.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/xitokemeniko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/016e9a1b-80ec-4100-8fd2-1c3f98bf3416/cronologia_grecia_antigua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1bafa3-bf94-4987-b9ee-024abac18974/hand_of_fate_2_alchemist.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/ammyy_admin_3._5_free_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc509ffb-fa38-47e1-b40c-ad07941c9995/fundamentals_of_statistics.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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 5248 bytes
SHA-256: cf79ec9a207f98a01dfda2e6d6835847ce06126e0296408b5c16ff66b53c5964
font_01_sfnt_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 10432 bytes
SHA-256: 3e6e2bed8586d1c4c88e00125d164c3503bf5a647d4556f48a109623a8ddd27d

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