Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6ef6b622674170…

MALICIOUS

PDF

73.3 KB Created: 2021-01-06 12:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c29268f56c36bee4c34aaf842dded296 SHA-1: 73751709551ec260852f4729048abadfed22e397 SHA-256: cb6ef6b622674170330ba6ee0688dc52a3b73078cd17b23951c92c4512cfbe9b
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 'ggtraff.ru'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The document body is heavily obfuscated, but the presence of a malicious URL suggests a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=chaos+index+8th+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5fd1545cc00c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370317/normal_5feb2d863669d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488810/normal_5fe73dad14b55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_5fdbd29033306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5f93ea8e560e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477137/normal_5fa769f3290fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_5fe7dca95de91.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b302a4-c292-429a-a5e1-c006c7e49081/the_social_work_skills_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/684a0cec-af32-45b3-9c80-5a4cba217a5f/21411184500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcfcb839-f9f7-40e0-9ca5-45a1a1da3976/waborivir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da2b0b2-28cf-4c85-9b63-50c1d5bb21fa/18976002136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f8de31-30ff-4691-9cc0-94b682cfd3d5/miseberovobonag.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_off0000e341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 4952 bytes
SHA-256: 7fdce3ae2f1384ec33f31593f7f517d2dee9673ffa249af854de42df14ad7834
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 10908 bytes
SHA-256: ef7f2e607423fbd250bad13754d4ee861ca98f6a04cbbd09f7acda149cedd2e5

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