Malicious PDF — malware analysis report

Static analysis result for SHA-256 4043a6ec972c0f0d…

MALICIOUS

PDF

47.7 KB Created: 2020-08-20 09:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0cd4bb31cd9e5b2bd3f0c058f671a3b SHA-1: 4bb4a9fc40d7f9ac094502384218de13c9893c23 SHA-256: 4043a6ec972c0f0dea5871f7524b13a14e6bc507d91ec3cc10cb10a8591a4ba9
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious destination or for SEO poisoning. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=assets+and+liabilities+form+2019
    • http://files.hearwellcandles.net/uploads/1/3/1/6/131606111/270712.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9799/files/28368044046.pdf
    • https://cdn.shopify.com/s/files/1/0440/6083/6005/files/lisodidobowimu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2982/2631/files/gigife.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/xipetarodizowejozutajupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0655/files/ripuberaxefixaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/7246/0702/files/wireborebezelupajuvek.pdf
    • https://cdn.shopify.com/s/files/1/0438/5567/5552/files/jadefemugemeliluzogimuvep.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9430/files/aprendizaje_significativo_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0439/2475/0504/files/jetelupatuxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3772/files/ditozopuxuli.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6119/files/xabuxepixunopudod.pdf
    • https://cdn.shopify.com/s/files/1/0433/3921/9099/files/66410432217.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/minedabirazo.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d42.bin
ef135cb1d5e5fc76f4637ce005e06e3b2f0efd282e7251baab32f45945a9556e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D42 5664 bytes
font_01_sfnt_off00007069.bin
e08c5ed4736698f81cc90241c6150dd7bad819b9cc12aaeb42f13500121c8394
pdf-font-stream PDF embedded font (sfnt) at offset 0x7069 12584 bytes
font_02_sfnt_off00009821.bin
8c41a960e9132288a2b11672e8aa4ea092ba241ada3249f743b882b13f1f6607
pdf-font-stream PDF embedded font (sfnt) at offset 0x9821 17528 bytes