Malicious PDF — malware analysis report

Static analysis result for SHA-256 41025af3fe291f59…

MALICIOUS

PDF

67.3 KB Created: 2020-12-16 20:31:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85a8af8810a014ca4cf04735490a9816 SHA-1: 122ba208cd06535627db89d892a77fe5d4831a6a SHA-256: 41025af3fe291f599d3415a869ae78994ee598199d8a80df2ff34d2604b9d829
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, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL indicates an attempt to lure the user to a harmful site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gettraff.ru/123?utm_term=silver+shadow+pdf
    • https://cdn-cms.f-static.net/uploads/4447914/normal_5fb444531ef8c.pdf
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5fc21e50707e2.pdf
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5f8cb42ad51e5.pdf
    • https://cdn-cms.f-static.net/uploads/4489835/normal_5fbcab42bbc5b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c150c04f-8a3d-4594-9831-c55a13cc3220/pti_course_in_haryana.pdf
    • https://uploads.strikinglycdn.com/files/f7c4ee2f-6c4a-4dd2-8a10-606bc3f1a269/mujeres_prepagos_honda.pdf
    • https://static1.squarespace.com/static/5fce68f85895864d89575f03/t/5fd633a6df2f0204c2300324/1607873446748/below_her_mouth_movie_isaidub.pdf
    • https://uploads.strikinglycdn.com/files/5e77edfc-87f8-4364-a3a8-0df76d0afd55/molupeluranijomezibasa.pdf
    • https://uploads.strikinglycdn.com/files/73da61ba-8cb2-4be6-9dd5-e66b80831c0d/sterling_shepard_outlook_rotoworld.pdf
    • https://uploads.strikinglycdn.com/files/fe5ef6a1-d3a9-43db-9333-d2b5145c72da/semat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca13.bin
3e05a578f53e700b2175236da23209283ba9d027dc5867ccc107bd4dfb13fa0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 5384 bytes
font_01_sfnt_off0000dc6f.bin
121627a2eef868dd9c00b459adaa63743565a877488e2b1dcec975bd6846046c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 10724 bytes

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