Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff8ddaea3a75fbf…

MALICIOUS

PDF

69.3 KB Created: 2020-12-21 08:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 243d54532fba4cf8d590c6513e4987c7 SHA-1: b737d0fe3deb1b09479d61fc5c733957f8d0dbc1 SHA-256: 4ff8ddaea3a75fbf19780c4a0a0adb8ebf8f63321d56ce64f99ecbe56e6f0010
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=adventure+academy+app+keeps+crashing'. This URL is likely used to redirect the user to a malicious site for phishing or to download further malware. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=adventure+academy+app+keeps+crashing In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f94f0b0bca17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f8a0a01186a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5faef444cffeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_5fb9201fe8502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446512/normal_5fc0d942e8b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_5faa2df9d5d67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfcd764be903ae6406b16/1606221021540/the_archfey_patrons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddd371f-4d3b-40de-a432-dd0265dd80db/33269100879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24439e7-0947-44a6-8714-47d9ed2e7c33/bixidobazevowozemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b51c08-7667-490d-b9a9-e11b7eaa3d9b/brooks_gts_15_mens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d94efc-32c1-42ba-bf0f-86ffcfe28e2f/43007911227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85db5f10-25b0-40c3-b3b6-5b4aeb8e1fff/87561213137.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c67840f1034a5ca82603/t/5fcbe5efbce7087d1aeaf582/1607198192739/krystopia_a_puzzle_journey_chapter_1_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50afd3d2-ebbb-43e2-9263-7f133677212f/75550519209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa7717c-e2fc-4592-8fe1-0aa24734e285/android_game_programming_by_example.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_off0000d02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02C 5672 bytes
SHA-256: 78444bdc1a27220d983d357feafaa2126c15ee7a1a3d6030171e54a8f7670e5d
font_01_sfnt_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 11228 bytes
SHA-256: d49f443ac092e29cf0205a446c79181acaee1a92087d0fb4ea47cdf6b879dc41

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