Malicious PDF — malware analysis report

Static analysis result for SHA-256 44621a4ebf233242…

MALICIOUS

PDF

40.5 KB Created: 2020-08-03 13:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b2ad9f2f966222dfc13de6105888d5 SHA-1: 5fe14e80190d06e036598cae548c1bf7eae16703 SHA-256: 44621a4ebf233242f7550c544b569e29445a8286e7e0acf8aa7615d25f3302a6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to a URL that appears to be a lure for a Mercedes E-Class owner's manual. The document body also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm designed to obscure the malicious redirector. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is likely the first step in a phishing or malware delivery chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/wb?keyword=mercedes%20e%20class%20owners%20manual%20download
    • http://files.bareraydiance.com/uploads/1/3/1/3/131379409/suwotem_lujofe.pdf
    • http://files.silkoftheorient.com/uploads/1/3/0/7/130739239/zodogara_zoxal_dodizedimi.pdf
    • http://files.gasperandassociates.com/uploads/1/3/1/0/131070160/951369.pdf
    • http://files.freightrainsandhorses.com/uploads/1/3/1/3/131384401/gewoxixijap.pdf
    • https://cdn.shopify.com/s/files/1/0434/2222/0439/files/how_to_delete_tumblr_blog.pdf
    • https://cdn.shopify.com/s/files/1/0433/4216/8218/files/nabaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/muxorabuzafafubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/faxizuved.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/5030742064.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/20425041707.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13121593915.pdf
    • https://cdn.shopify.com/s/files/1/0437/8145/6023/files/79786349328.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/tadoguk.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/42504563378.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/kibosusivinozilijufoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4454/files/wuwadugo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060b4.bin
1fc2258f2bbe34b4681ac401540c088dea750b9be73536eb3abe2581d27df2fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B4 5184 bytes
font_01_sfnt_off0000725b.bin
cbf4636d8ee534382f18a5ac4afc4d924983f866b9c62ed9902663dce313654f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725B 10220 bytes

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