Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab542041856de315…

MALICIOUS

PDF

43.2 KB Created: 2020-10-29 03:00:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8e873f71c3b6a1688f760dc1fff3b4d2 SHA-1: 2f42a18431ef4c01b909ee3f72f6969e4b48f68a SHA-256: ab542041856de315a9bf4e1dcd5e4db0e4c4db33d80dfcf22e696f07e240726b
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=questioned+document+examination+ppt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_5f97d512a19f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5f888fb36d27d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f881de15358d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f8bef1225c0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f8a0d0486115.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/f81230f5-de6d-405b-add1-74bdfd37115c/zetuziwuliwopalegimevaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecab0c8-8f9f-4901-b778-4f7c0ab8b4c6/zutinidejem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeceafc0-aaa2-4ff9-b631-22e984182e5f/60965579543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8013b63f-1828-4638-a606-47c30c7afa34/6461078035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfedd42-fdde-4318-b1a9-a5bf395aaaf6/disgaea_5_4-2_grinding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6986777-c528-4aa2-94ac-76e3e24a42f5/90041803882.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/arterial_blood_gas_analysis_made_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470d382c-3351-4fef-90e6-67ee099bc6cf/24794631086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf011a4-2598-461e-bd9e-c62f977e8837/35527537606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cca258-1ac3-4a8c-9df6-51f97196aedb/vujefomosugegemax.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_off000069d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D9 5220 bytes
SHA-256: eda94de000dd98c846f960d4646a7ce5d68867ed1094e2f4b420acba438868b4
font_01_sfnt_off00007b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8D 10704 bytes
SHA-256: 97c2f94fc639b116e742d13ae901afdf6c767b7e8103c20e9702fa634eddfb41

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