Malicious PDF — malware analysis report

Static analysis result for SHA-256 5023bea6a4329d4e…

MALICIOUS

PDF

70.7 KB Created: 2020-12-28 09:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 939eba811035f8c9ef9d4eacbf13c03f SHA-1: be1e0236143d8dc4b2553b62aeef82e0cd98d0d3 SHA-256: 5023bea6a4329d4e189b108e711c1cefe9684751b7ec66a6fe6ad072958dfb2a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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/strik?utm_term=rumble+stars+football+tips'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, likely as part of a phishing or malware delivery campaign.

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=rumble+stars+football+tips In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fb86c1e6b9e9.pdfIn PDF document text
    • https://xotiroxo.weebly.com/uploads/1/3/0/7/130776105/jazozogifitumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f8cc4bf18892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366397/normal_5fa986ca468f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_5fb3ef8027092.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5fca951c7c669.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373755/normal_5fcdb0ec23c71.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/iehgeq4/nafagine.pdfIn PDF document text
    • https://pozujejax.weebly.com/uploads/1/3/4/6/134679154/bivujovize.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/pukiza/achtung_panzer_guderian.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/dog_barking_complaint_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/lotoxedozosovunafexa.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/appareil_uro_gnital_fminin.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/nopevepawixaxef.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_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 5196 bytes
SHA-256: 9a795f09d094bcadb8263d134c6d38b000609b0493e04dcd5a8b9a2836833163
font_01_sfnt_off0000ea14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 10608 bytes
SHA-256: 06d6ebb8d939d6abca39d2a15e0f2fe093cc0063cea47cf2f29ccd84e6097e8c

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