Malicious PDF — malware analysis report

Static analysis result for SHA-256 179c87631342c2c2…

MALICIOUS

PDF

38.8 KB Created: 2020-11-04 02:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 328e4eb9c64f417745a6113a183895c2 SHA-1: e08014ca89ecc54972497dab434dae59a6692616 SHA-256: 179c87631342c2c222395567f24f4bbf3bb6d012c61d1111d6c6230b1d30c836
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/strik?keyword=starfall+calendar+2020, is the primary indicator of malicious intent. While no scripts were extracted, the PDF structure and the malicious URL strongly suggest a phishing or malware delivery 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/strik?keyword=starfall+calendar+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f98c92732583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f8e2af14f082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5f8b7b7912a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f87926b95ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444864/normal_5f9c867eb36c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5f94fa18749d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379034/normal_5f8cbfca1643e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f9b7e1a1f1d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_5f94d82af2b58.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/6d10269a-b77c-43e3-b7c3-46a4028c4ed5/4127684462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2191f2-5fc4-4431-9a54-1cf68da21c7a/light_switch_extender_diy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be8f2a1-a324-4409-8507-a77d187130ee/alkaline_diet_recipes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4491 6392 bytes
SHA-256: 2133d8b7d4db64a29c4f51e48560d7bd11b5eee62a74fdfe954fe37a053e5135
font_01_sfnt_off00005a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5E 5216 bytes
SHA-256: 29e4f4def3cd19d696c68b66955faa717da2ab1e361f3bc44d809b8b00e92e0f
font_02_sfnt_off00006c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C27 10100 bytes
SHA-256: 48dae77553240895c5d4c6cba3857713e24bafcfe2ef8613024c2529f5881123