Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24433ab8e3ac2a0…

MALICIOUS

PDF

54.6 KB Created: 2020-08-08 14:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a668b27ed50345f658cc55264b7e30e SHA-1: 8ed48e86cbbb80be623bceef6d87409a46e8cd76 SHA-256: f24433ab8e3ac2a071be2ad36626e7a084b7c1ef453866314b47643cc04ff491
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, likely to distribute malware or engage in SEO poisoning. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of this PDF. The primary attack pattern involves luring users to malicious sites via these embedded links.

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.ru/pify?keyword=autocad+pdf+underlay+slow
    • http://files.akiineventos.com/uploads/1/3/0/7/130739826/15317346c3c.pdf
    • http://files.kirstenmickelwait.com/uploads/1/3/2/6/132681851/xojataku.pdf
    • http://files.englandaccounting.com/uploads/1/3/0/7/130776370/fabafeti.pdf
    • http://files.thesciencelady.co.uk/uploads/1/3/2/6/132695467/89a8e58d58.pdf
    • http://resek.holygemstone.com/uploads/1/3/1/1/131163590/9198730.pdf
    • https://cdn.shopify.com/s/files/1/0429/7841/0655/files/sudagiduwuwotoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7303/files/as_3500._2.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/94126626543.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/muwanekizarebiwizureto.pdf
    • https://cdn.shopify.com/s/files/1/0431/4634/6658/files/bufosikupabakalirunapef.pdf
    • https://cdn.shopify.com/s/files/1/0433/4632/9750/files/uat_testing_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/74578034768.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/24853665293.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0431/2599/7722/files/legitujizumepiwopedonu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000783e.bin
cf5e12d2113e49dccec3fb442075f7e1c94985a207f1f1f36c25b5412f4517f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783E 5332 bytes
font_01_sfnt_off00008a85.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A85 1800 bytes
font_02_sfnt_off00009313.bin
b2eb8037534d2b980eaccbbf18d2afc98113207dd74d8ac36b4e14b7c13e2128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9313 10656 bytes
font_03_sfnt_off0000b7c1.bin
b2ddecaff7e2361bf51021b35f9c014659943b600c4f466cb4656cea9e83b80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C1 16088 bytes

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