Malicious PDF — malware analysis report

Static analysis result for SHA-256 c712a63de31a73f6…

MALICIOUS

PDF

49.7 KB Created: 2020-08-20 22:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d4cb1b1c19a2e773e57dcfa6926681d SHA-1: a9a358303625cac12d0b6e578f3a726cac32bcdc SHA-256: c712a63de31a73f6b4f291b202533eb9b2f464a07035ee8d646b598eb8369a0e
150 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.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure to download further content. The ML classifier also strongly flagged this PDF as malicious.

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=biblia+catolica+latinoamericana+pdf+descargar
    • http://files.christinetracy.com/uploads/1/3/1/4/131411762/xajejuw.pdf
    • http://files.njall.org/uploads/1/3/1/0/131070351/1875241.pdf
    • http://gugimuvu.aerofamilyhealth.com/uploads/1/3/0/7/130738964/wififakige.pdf
    • http://files.classofjesusministries.com/uploads/1/3/0/7/130740530/bepetulezifalix.pdf
    • http://doxuzume.forestburgbaptist.org/uploads/1/3/2/6/132681947/3096031.pdf
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/barbarian_assault_guide_osrs_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/81669378241.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/81710192571.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/tejizifixepemonatisomoko.pdf
    • https://cdn.shopify.com/s/files/1/0439/7305/0526/files/tesanirakudadata.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/reddy_heater_55.pdf
    • https://cdn.shopify.com/s/files/1/0437/0133/8280/files/50449892653.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/jalemulokosawugutun.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1567/files/44346953222.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/41113037444.pdf
    • https://cdn.shopify.com/s/files/1/0437/8791/1319/files/afl_football_fixture.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_off00007f65.bin
8c4362fd4ac91c28677954e53c617370fb2b8071d11694b8d1249e1f0ed759c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F65 5664 bytes
font_01_sfnt_off0000927d.bin
59022d4c3bb76b06aab9ebb924f9c8b317f5a67cd8aeb340de3ba9e48c352ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x927D 11512 bytes

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