Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef97c86ce35010c8…

MALICIOUS

PDF

66.7 KB Created: 2020-11-26 01:18:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ec1712d81c653011360c3de7127cf5f SHA-1: 1a4ee8aae449058b6b876af4e8732e3ec6330350 SHA-256: ef97c86ce35010c803b77b2e2ef8561a74a93ddde5836526a5fed83ba11d67c4
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 'ggtraff.ru'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL indicates an attempt to lure the user to a compromised site, consistent with phishing or malware delivery. The document body appears to be obfuscated or corrupted, preventing further analysis of its content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=going+from+standard+to+factored+form
    • https://cdn-cms.f-static.net/uploads/4459463/normal_5fa6e69b513fc.pdf
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5f9e50ea14293.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bubeto/decompile_apk_windows.pdf
    • https://uploads.strikinglycdn.com/files/e769a062-3614-4f4f-b952-fd18698d8efb/68088964995.pdf
    • https://uploads.strikinglycdn.com/files/200997db-692f-42b3-b845-f8ede7914a7d/stardew_valley_geld_verdienen.pdf
    • https://uploads.strikinglycdn.com/files/13aa8e4e-2fcb-429d-8e44-5be2bfe03c6e/vixevupivezopezuzoxami.pdf
    • https://uploads.strikinglycdn.com/files/fbf47725-4e29-40e1-b317-d1047f42db62/kobidomerave.pdf
    • https://uploads.strikinglycdn.com/files/a6fbbb5b-92c5-4c43-b526-cb13b1b8efa5/ruxotoriwiwutol.pdf
    • https://uploads.strikinglycdn.com/files/66fb0368-06e0-4138-b94f-3a06486ba57d/donde_habitan_los_angeles_gratis.pdf
    • https://uploads.strikinglycdn.com/files/64db880c-bd57-4b7d-b680-8a35819324a3/23703437267.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b993.bin
48b78a84f3f0d58315d544c750864f78525af41c5cc76c81ed5d349828ec00bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB993 5128 bytes
font_01_sfnt_off0000cae4.bin
55ba6d81927b394efff205ac941ac8001ab147ed1d9dd5ff5cccfee9d7f66529
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 10884 bytes
font_02_sfnt_off0000f00e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 4324 bytes