Malicious PDF — malware analysis report

Static analysis result for SHA-256 13555f1fface90f7…

MALICIOUS

PDF

68.4 KB Created: 2020-12-01 10:05:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 037a8894bf4b37ee6d037c59ad1c2c20 SHA-1: 1658cfc3d30754d8086e240d3917649c8795fffa SHA-256: 13555f1fface90f78c6de0c55a5b92027ca4ae7a3b94ac7fad87eaf300b27be8
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by multiple engines, including ClamAV and an ML classifier. A critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?utm_term=bangladesh+vs+pakistan+t20+live+streaming+online'. While no scripts were explicitly extracted, the PDF structure and the presence of a malicious link strongly suggest an attempt to redirect the user to a harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/strik?utm_term=bangladesh+vs+pakistan+t20+live+streaming+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5f990a066f455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411696/normal_5fb48448906d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f89e964ca67c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f89c61b05cd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_5fa8fa2c3b841.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454425/normal_5fc46e33bfd9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8824ed3bb9d.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/xanunafojuloki/46490180560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a5629d-cfcf-49e2-9ffa-3cbd33ef467e/75014034859.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/bozodewakuvaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03e03f1-bc11-4126-b335-0322d11b03fd/the_weather_network_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/elerethe_renferal_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/75018656361.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/beech_hill_primary_school_luton_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/2020_calendar_templates_editable_by_word.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/lego_vending_machine_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/pay_raise_request_letter.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_off0000cd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2F 5820 bytes
SHA-256: f0805b405e5a6429935f9096c15d9a9b7a42407996be09a3bd4dc0f27b7fc94b
font_01_sfnt_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 10384 bytes
SHA-256: 65da83cd2874b7885e74ac2d51c657466dca110a5aec40e73e59c7d1004dfabe

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