Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5b65e73a6a2441…

MALICIOUS

PDF

93.0 KB Created: 2020-08-20 14:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6b5e4c72ad338a835d6d4e4c9b06f7e SHA-1: 1b049c098d82e7358a488ceb01383aa96c4148eb SHA-256: 6a5b65e73a6a2441aa37a7e8b99d9724f03002dddcf332a23c00d3cfa2b84ac1
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of a link farm heuristic further indicates a malicious intent to drive traffic to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.com/pify?keyword=varicocelectomia+tecnica+quirurgica+pdf
    • http://files.foltzcenter.com/uploads/1/3/1/3/131384663/7762501.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/8371/0108/files/fenirurutewunufik.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/ziposijekeba.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/fukalotemopajugajifoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9889/8592/files/handbook_of_applied_econometrics_and_statistical_inference.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/bugez.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/semodojapukazev.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/mapa_mundi_para_colorir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/nigubudasewim.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001246f.bin
e4814046246528325e64b8a46880326e700ccc13faa1cf1e533418d9174603a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 5268 bytes
font_01_sfnt_off00013637.bin
a5fdaccbbe5dc52987ae1929810039889c913eff4130a03cf31f39eb5049e92c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 10428 bytes
font_02_sfnt_off000159a2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x159A2 4324 bytes