Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d604d0a65a90bd…

MALICIOUS

PDF

76.2 KB Created: 2020-12-28 08:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d07a0ca981da85d8090798b40aea04b SHA-1: 474a983ff3c11ae2be2ff4b420edabc710dec1e4 SHA-256: b6d604d0a65a90bd3c04f912e3fd00a2d078629cce258de8ec544aee657b330d
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized PDF files, suggesting a link farm or redirection scheme. The primary redirector URL, 'https://traffnew.ru/strik?utm_term=dual+enrollment+classes+meaning', is likely used to funnel victims to a malicious site. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a link farm points towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffnew.ru/strik?utm_term=dual+enrollment+classes+meaning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469645/normal_5fe29c282a5cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_5fb376785a65c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5fc3ec4b41d79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_5fa69dea9c759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_5fa6f515593b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471479/normal_5fb54e76beb5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5f951a9916013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5fb5bb2e456c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5fe061935642d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421983/normal_5fa0b54da4302.pdfIn PDF document text
    • https://cdn.sqhk.co/jokutevek/EKvzhaK/25702357310.pdfIn PDF document text
    • https://merafapubumuvu.weebly.com/uploads/1/3/4/8/134887465/6192100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 5116 bytes
SHA-256: 8ad082d56df8b1ec6e964df90091b9909233d84077c5d137741ba3c0fdafb44b
font_01_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 10780 bytes
SHA-256: 9ddb3c5254dc6032f264962c24d5c1cd7cec9e5098d55874886625147fa9b4b6

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