Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0436dea39e553e…

MALICIOUS

PDF

32.8 KB Created: 2020-11-07 16:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0f38bc0709b8e019a740796cb85de9c5 SHA-1: 5d79452aca71d89ed492233edb69457c94314767 SHA-256: 5a0436dea39e553e5a5ac3dae8d36b998df0e740ffcec3db62e472c1563eb95d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://cctraff.ru/wb?keyword=minecraft%20skin%20editor%20apk%20pc', is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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://cctraff.ru/wb?keyword=minecraft%20skin%20editor%20apk%20pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403428/normal_5f9a1d4f39f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f912924497c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f91b02794b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f873ba61f0f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://filejemebake.files.wordpress.com/2020/11/77761181000.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/kaputefubixurivakatijun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2610cafa-727d-46e0-88a7-c1344a4c8db5/lifolitami.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/zakafagavagovosajuviruj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e71fc20-0897-4756-bdaa-3e79e3a41e2e/viremixem.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/45783285263.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/innovation_defined.pdfIn PDF document text
    • https://selogum.files.wordpress.com/2020/11/bad_blood_secrets_and_lies_in_a_silicon_valley_startup_by_john_carreyrou.pdfIn PDF document text
    • https://ranulog.files.wordpress.com/2020/11/98614920919.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_off000044ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44CA 5188 bytes
SHA-256: a1d64153f4719287faa7112093eaa51ed3477dbda22c401c1546652013229789
font_01_sfnt_off0000568e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x568E 9404 bytes
SHA-256: 67442fc6f5aa6f7d2989a3bef0c75cb9fab30c3befbfea028a43fd4102d48a19