Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f39a78d8ddbce6b…

MALICIOUS

PDF

70.1 KB Created: 2021-01-03 14:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd287a6e90bc6660d5585757384415f0 SHA-1: 774096fddca07ba3b87c224afad3d39e55be11cd SHA-256: 1f39a78d8ddbce6b659d619e732db726de026446d161fea347bfbdc9272da040
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. The embedded URL is likely used to download and execute a second-stage payload, characteristic of phishing attacks delivered via attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=english+1+parts+of+speech+review+answers
    • https://cdn.sqhk.co/jefokejab/gdiTshR/gixiwumajozuzapiwareti.pdf
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5f8dfdf0d6d8e.pdf
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5fc2ccb6a387d.pdf
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fa16f244bbd4.pdf
    • https://cdn.sqhk.co/boxokozofe/gYhe9hd/god_of_highschool_battle_theme.pdf
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f8ee1aca53ed.pdf
    • https://cdn.sqhk.co/taruvufufezu/X1JgBWS/autocratic_leadership_skills_and_qualities.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9ecfedf6-3e1d-4411-83f1-2e6370cd1521/mount_and_blade_warband_viking_conquest_serial_key_1.173.pdf
    • https://uploads.strikinglycdn.com/files/1bb34cec-6a0a-41c7-b83e-a9161dc134a5/lobefutotewivo.pdf
    • https://uploads.strikinglycdn.com/files/a19c41f6-707a-4fac-a1d8-fcf58deab73a/pifax.pdf
    • https://uploads.strikinglycdn.com/files/6e7bc490-38ca-4ef4-ba32-727f834ff79e/xejudixudakuvopalegodane.pdf
    • https://uploads.strikinglycdn.com/files/4b846c43-fae2-48fc-b74d-82145b882452/5166129935.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a8.bin
5664c82edefd8a1037a16d4e2854443d58bfc5d74b22df17ec35bfbfadef6ee1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 5440 bytes
font_01_sfnt_off0000e546.bin
5d143791f03b01bb4e1e8f3d404b75ae26f4acbabdb6a034e3d1c434e200cd91
pdf-font-stream PDF embedded font (sfnt) at offset 0xE546 11192 bytes