Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa85a11b077e55a…

MALICIOUS

PDF

56.4 KB Created: 2020-08-08 17:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96f7db0cf252d376821bb0a8617fe9d7 SHA-1: c109ae28df13e37d3420e90714e4db84a942a614 SHA-256: 9aa85a11b077e55a6014716154cce6082fee9d709d4fb119fa1229e255173906
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload execution.

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=100+opposite+words+in+kannada+language+pdf
    • http://files.behealthyaz.org/uploads/1/3/2/7/132712006/tozuvunorimi.pdf
    • http://files.floorcareandinterior.com/uploads/1/3/2/6/132695535/39b9b51.pdf
    • http://files.bviark.org/uploads/1/3/2/6/132681910/6c15ecb990d4f75.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/80951352635.pdf
    • https://cdn.shopify.com/s/files/1/0428/7542/0835/files/sadikenirefol.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1927/files/kopidakipige.pdf
    • https://cdn.shopify.com/s/files/1/0439/2560/2472/files/87701277023.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/50188705031.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/rusimudawirorez.pdf
    • https://cdn.shopify.com/s/files/1/0440/6670/1477/files/sonabumupuzemomoxeb.pdf
    • https://cdn.shopify.com/s/files/1/0436/5297/2697/files/52233776594.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/21649898797.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/crossword_puzzle_maker_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7992/4902/files/64481159588.pdf
    • https://cdn.shopify.com/s/files/1/0429/7064/4631/files/lukef.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
stream_004_off0000883c.bin
ec081e24746f603eb5e2f2bad8d73f9e2a58e2d63bc53f491af46527738df556		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x883C 11744 bytes
font_00_sfnt_off0000757b.bin
6f63fae6c55f37116cf709044f0e6cf281f45954f87c88aa0dc5c1172f719082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757B 5464 bytes
font_02_sfnt_off0000a7a0.bin
cddc48d6deec9e39f52fc257532c2ad4e5755ac620bcef416a94d61c8c360433		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A0 13768 bytes

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