Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8435d84f4dcad97…

MALICIOUS

PDF

33.9 KB Created: 2020-09-16 21:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25035a694b87d45899682d8a0e1df57c SHA-1: ce0341ad0b88e27b4e1e544de021dddb18c32710 SHA-256: e8435d84f4dcad97b7f1094768d35aa062f499797a8358b5c0bdfa95cd2e0cfd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.me, which is likely intended to lead the user to a malicious site. The document also features a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.
  • 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://ttraff.me/wix?keyword=substitution+exercises+maths
    • http://files.inkwellretreats.org/uploads/1/3/2/6/132680932/d9f71334b9249.pdf
    • http://files.pittsfordfoodcupboard.net/uploads/1/3/1/1/131163516/repod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/15310647505.pdf
    • https://cdn.shopify.com/s/files/1/0433/6713/7438/files/62350985805.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/kasofipiramexuka.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1988/files/10753552502.pdf
    • https://78fabefc-883a-4773-9a3b-737225de2504.filesusr.com/ugd/e49726_cd8f624569e9462990d6a21afc1bd93f.pdf?index=true
    • https://418578bb-b5db-4b50-bad5-42b882febd13.filesusr.com/ugd/bc0b97_3f756adb93584e89951ada319f1a67c4.pdf?index=true
    • https://a1c73cc7-bf01-498c-bb48-58b5e2ed57fa.filesusr.com/ugd/bdc04d_37ab857e265548ce800478e16195fb5d.pdf?index=true
    • https://3622607e-29fb-491a-9a91-43e2c00cf37c.filesusr.com/ugd/3bcfef_62aa24c6c8824976898e36ad982db66a.pdf?index=true
    • https://6d443d49-6931-432c-bdec-307b9a01771a.filesusr.com/ugd/cb4a18_3bc3c08ee8494cd08a5dac778a30a45d.pdf?index=true
    • https://a329d061-d875-47ea-a852-be16dedb270a.filesusr.com/ugd/9c0842_76b758b4eff5422f94dbe1740b94b45b.pdf?index=true
    • https://478a8a49-99e2-457a-aad3-44f22167c367.filesusr.com/ugd/f80014_7e907cff10304fac9af919f9fa1f619c.pdf?index=true
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047c0.bin
2dfd651eeb8f42cc272c64512d33ffaf69fd5be453446757d8bbcf939ea1b42c
pdf-font-stream PDF embedded font (sfnt) at offset 0x47C0 5320 bytes
font_01_sfnt_off000059a7.bin
2a45a5e06306b902f15cca55bf8bfa1a2ea3dd845e1a0f4ef6a87256a85c94f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A7 9760 bytes