Malicious PDF — malware analysis report

Static analysis result for SHA-256 57853be01ab93859…

MALICIOUS

PDF

36.0 KB Created: 2020-11-06 18:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 636181f66978982b79a0a72b903a7785 SHA-1: 5cbcfd2ff7837e68b617676bb199de000aefd040 SHA-256: 57853be01ab93859ea93690b4507eaa12173d57c723c791801f50deb12d48ca1
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. One of the primary links points to 'https://trafficel.ru/123?keyword=zombs+royale+unblocked+games', which is likely a lure. Although no scripts were explicitly extracted, the presence of numerous external links and the 'ML_NYX_PDF_MALICIOUS' classification indicate a high likelihood of malicious intent, possibly involving the exploitation of PDF vulnerabilities or the delivery of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?keyword=zombs+royale+unblocked+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f89fe349a7be.pdfIn PDF document text
    • https://papokerudinex.weebly.com/uploads/1/3/4/3/134310480/cebba72f33a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f9c25c63386c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_5fa5740e10ea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_5f9a5e0ae7b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_5f975f6131986.pdfIn PDF document text
    • https://pibemalogodozod.weebly.com/uploads/1/3/2/6/132681910/zigujafupeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f86f95fa0ed9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452593/normal_5f9f369caf029.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/8fd19035-0f8b-4e22-806d-3e21e8c9f75d/volomuxom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791c6d14-b19a-4692-804b-6bb75fee5f7d/11998880566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57610301-906f-4d8c-8601-2bc72793b750/97657734819.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_off00004d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D59 5520 bytes
SHA-256: 3fcf8758229bd181b87b824583eff39d910f37c200b6cb5fd314ab64206de40e
font_01_sfnt_off00006012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6012 10268 bytes
SHA-256: 3e084ab8352cdf9a93f5e342fac118f9d95474ca6fa2957bacbf8e045d7e8f66

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