Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d81c6806400bdb6…

MALICIOUS

PDF

65.5 KB Created: 2021-01-03 08:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d1d4a1eccd886d6f65595dad5178662 SHA-1: 7069667899bc93f1c95a08a6286e8f3ddf504c44 SHA-256: 3d81c6806400bdb6f915db81da7e467266dc7b574834ec0f6e1b441347604cf5
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://cctraff.ru/123?utm_term=tv+parts+today+reddit'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the redirector suggests it could be used to deliver a second-stage payload or lead to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=tv+parts+today+reddit
    • https://cdn.sqhk.co/divekezor/x9AhibK/state_of_texas_uncontested_divorce_forms.pdf
    • https://cdn.sqhk.co/vuwewiwudesi/eIhjijE/nonemukavanexalusazarovu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fejenijovekozu/how_to_develop_a_perfect_memory_amazon.pdf
    • https://uploads.strikinglycdn.com/files/1cfc440d-0e90-4729-af77-8d5a57bbcf26/21150114621.pdf
    • https://s3.amazonaws.com/fuvidokibet/92135845468.pdf
    • https://s3.amazonaws.com/tanapilamaxi/basic_guide_to_strikes_lockouts_and_picketing.pdf
    • https://s3.amazonaws.com/gezetega/act_explore_results.pdf
    • https://uploads.strikinglycdn.com/files/68cc9703-fdbe-4421-977a-ec4a42ffafe2/87624316144.pdf
    • https://uploads.strikinglycdn.com/files/4629c826-1db3-4cc1-8dbe-9c1cc87681bc/72508172778.pdf
    • https://s3.amazonaws.com/padadutiseni/perth_tv_guide_today_wa.pdf
    • https://s3.amazonaws.com/remuv/62242593353.pdf
    • https://s3.amazonaws.com/dojonuta/atl_marketing_full_form.pdf
    • https://uploads.strikinglycdn.com/files/b2e31c92-df31-4b92-8834-822e7c6ed9b1/4362380807.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c524.bin
8adc10060e94cf3505725cf342e1d1fa7f2950fbff8bfa03272d48b2079ac948
pdf-font-stream PDF embedded font (sfnt) at offset 0xC524 5032 bytes
font_01_sfnt_off0000d65a.bin
3b376cbbb9906fcdcc0eca022db65fca64fb4272df9aed63bce0d42424597497
pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 10356 bytes