Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6749bca2d55a574…

MALICIOUS

PDF

44.4 KB Created: 2020-08-31 03:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99f60b7fda1cd7f4be552bf1dbdab3e6 SHA-1: d219567fa110e2f9b54b130257cc6c3687927801 SHA-256: b6749bca2d55a5744aec2549a9da101bdbce1f51cf14bf05f8b0d6b7e55d750d
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a large number of external links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=p90x+nutrition+macros', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and embedded URLs, further supporting the malicious nature.

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/wix?keyword=p90x+nutrition+macros
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/british_english_accent.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/wajobonalix.pdf
    • https://cdn.shopify.com/s/files/1/0435/9025/4749/files/pokusavewabuvidamadosisez.pdf
    • https://cdn.shopify.com/s/files/1/0444/5303/6199/files/agriculture_licensure_exam_reviewer.pdf
    • https://cdn.shopify.com/s/files/1/0430/1049/0519/files/for_their_experimental_approach_to_alleviating_global_poverty.pdf
    • https://static.usrfiles.com/ugd/804ff6_5e88dfccf61e408187499b3ffa8cfb00.pdf
    • https://static.usrfiles.com/ugd/a48928_f3f68753a5174dd0a68c80012891b1cb.pdf
    • https://static.usrfiles.com/ugd/71fd01_51d3541491d140dd81392708614fd8d9.pdf
    • https://static.usrfiles.com/ugd/63022f_fa6b8fc4b8a14502aa0b00a421886dd5.pdf
    • https://static.usrfiles.com/ugd/3bf302_1637d15db84d49f1b03afe586080705e.pdf
    • https://static.usrfiles.com/ugd/0d9a50_1e3bbacff29349c2aa71da1d3d92a949.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6471/files/mechanical_and_electrical_vibrations.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/ripagi.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_off00006baa.bin
dd0280ca88773f6d4189031c139d8ec7f0db663ea0294cc78cbc8b321c045f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAA 5280 bytes
font_01_sfnt_off00007d79.bin
82a482a4559377de5f8e474c170ef3f34512a58dcd00d74cca0fc69228bcbe17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D79 12140 bytes

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