Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8afc0d06c3169b…

MALICIOUS

PDF

68.2 KB Created: 2020-11-20 09:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dc78deee103c22e451337dbf4705a3a SHA-1: 7684d37992463674fde5aadba925ea2917c74886 SHA-256: bd8afc0d06c3169bbd41be589a5601911ddd19637f74c43e2b9a63ea32787078
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/aws?utm_term=dead+air+stalker'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/aws?utm_term=dead+air+stalker
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f8d25b60ea7b.pdf
    • https://cdn-cms.f-static.net/uploads/4473640/normal_5fa51245b0d0c.pdf
    • https://cdn-cms.f-static.net/uploads/4461219/normal_5fb5fafcbee74.pdf
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8e89870f8a6.pdf
    • https://cdn-cms.f-static.net/uploads/4382201/normal_5f8cafeb673ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fatikonavori/payroll_accounting_download.pdf
    • https://s3.amazonaws.com/wukara/fawujizexar.pdf
    • https://uploads.strikinglycdn.com/files/b6967819-feeb-4744-849a-721ff9205641/95646546452.pdf
    • https://uploads.strikinglycdn.com/files/883eb61e-e7ad-41b8-ba9a-f94ce92dd5a5/78657554529.pdf
    • https://uploads.strikinglycdn.com/files/d19be21e-002d-4c34-aef7-dc007e133068/88789057271.pdf
    • https://uploads.strikinglycdn.com/files/9b0e5efe-d541-4d59-87b8-454d434f6ac4/76801789618.pdf
    • https://uploads.strikinglycdn.com/files/b0fcff37-1495-430e-837a-90447ab83fff/59974561506.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e93d.bin
e8787871493bee90ccb6d284850fc54b5392712549d4595a729331824c3ea415
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE93D 17900 bytes
font_00_sfnt_off0000b2ec.bin
58f6026b9047dabb3a32231617b6583ad250aed3b0c81586fa289a85dede8dcc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EC 4884 bytes
font_01_sfnt_off0000c397.bin
cc21e37ec1795cc28fc05c957bd966119aea15e0c0025f973a5fdc28f703d8c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC397 11640 bytes