Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de5a23c144dcf6c…

MALICIOUS

PDF

32.9 KB Created: 2020-11-07 04:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f976e77e40afbe9726477196631bdf8c SHA-1: 2e920e5364025581618ba64aae35d63fd6d25167 SHA-256: 1de5a23c144dcf6cb7e9e577de105edebc9361731efd1152be44cd7a0b222c2f
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://traffmen.ru/123?keyword=ncatt+aet+study+guide+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f87407c33db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5f9e733aa2273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402964/normal_5f9b7d75a44cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_5fa5e2366e673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459936/normal_5fa0fc62a53bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f8e6b71be7eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5f9e708153095.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://saxofenofam.files.wordpress.com/2020/11/27498594556.pdfIn PDF document text
    • https://vabowuzi.files.wordpress.com/2020/11/dell_dimension_9200_specs.pdfIn PDF document text
    • https://jikuboji.files.wordpress.com/2020/11/3746841527.pdfIn PDF document text
    • https://vilawajor.files.wordpress.com/2020/11/49288782846.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_off0000438a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x438A 5268 bytes
SHA-256: f832d9cca1a1b655b2f60171865b563d632901746efdf2ff220a0dde0d6d2e7f
font_01_sfnt_off000055a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55A2 10040 bytes
SHA-256: 6717594d44b95468f0e7a59b1659dde63f23eb825a0587934bb3a6c84afd1d3c

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