Malicious PDF — malware analysis report

Static analysis result for SHA-256 0338a4d6eb8ac414…

MALICIOUS

PDF

71.7 KB Created: 2020-11-26 18:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f9e833719ba614d25ce3c32e9480022f SHA-1: d392c0a47867e3f99de04d046e46e9372a90e66e SHA-256: 0338a4d6eb8ac414bf2b6289aa36971795ee0606661540fa89fe5474d17cae34
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://traffmen.ru/strik?utm_term=cyberpunk+2020+armor'. This indicates the document's primary purpose is to lure the user to this malicious URL. The ML classifier and ClamAV detection further support the malicious nature of this PDF. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://traffmen.ru/strik?utm_term=cyberpunk+2020+armor In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5f92718fbf921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fbf2ad6897f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f893ce9c83c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f87182dd68a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5fa430703ef13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5f95dc8dbfae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f8f97f72d4fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_5fbbece5acdb3.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/vososasoxumete/pibelepuvema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7653b455-05ab-446f-ae54-7ab3f762e3dd/stories_i_only_tell_my_friends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4d6cae-156c-437c-ad1d-7bde31c575b5/4188460972.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/examen_de_conciencia_ninos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4eda732-ffa8-42e3-b1aa-1bfcbd27b58a/how_many_chaos_runes_for_onyx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bf4d1a-b351-4cd6-8874-77d8b91b7b26/54558200331.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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 5240 bytes
SHA-256: 0bdef035bf521da4bbb2a9d7afbe1fc2f6049ddec88c27241e3dcc4b4263e3fb
font_01_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 10920 bytes
SHA-256: da248b60b1dbc23cf1642494ae3973f76c3878f72c20e99bebca25cf49ce26a4

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