Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74fa28702de0964…

MALICIOUS

PDF

51.7 KB Created: 2020-10-30 19:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fdce0a5e662d5b5d9c6dfc21f9c2691d SHA-1: ed0cb765afaaf54ae74b44673eef3aa7b9acc645 SHA-256: b74fa28702de09647e43757da639f50af4cb08a71a729c145cec11dbfacb9a02
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, https://cctraff.ru/strik?keyword=cordless+angle+grinder+reviews, which is highly indicative of a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the critical heuristic firing suggest the document is designed to lure the user to a malicious site.

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/strik?keyword=cordless+angle+grinder+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_5f97676bda341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f8df9dcc4403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5f99a720d2349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f86fb570c1cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_5f93ec80d8ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_5f97a1d9eea2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f8a044bdac83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f8d392613daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5f967e9d9fb3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c91804e-a9ee-4f3e-bf86-6d7ec15751cb/62518609467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e87ee17c-5d96-4c75-a2e1-78724195e619/87957512015.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_off000089fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FB 5048 bytes
SHA-256: 26519e28f0d84035a2930aa11690665a8d11bfd90205551d340d8a86856b2bc7
font_01_sfnt_off00009b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B43 11488 bytes
SHA-256: 6d971bb1c5952d0698e06f4ff4ed90104e8f83d9fc753a10fc8fbed36553cff5