Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d20192dcae0439…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 13:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97b7c6ad8c58f3d434af5a24cc7ba37f SHA-1: 623800987709cbc3caf430fe1fa75541edd8ef79 SHA-256: f2d20192dcae0439a4649fe0fe73f77605b788293a23d3134420a37e2639ef74
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/wix?keyword=eliminado+de+la+rocka+hipica', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=eliminado+de+la+rocka+hipica
    • https://static.usrfiles.com/ugd/b8c837_235f4b208c544ea4a61d2f19902fb17e.pdf
    • https://static.usrfiles.com/ugd/66c878_bd210129cd764e25be5368ed72fdee40.pdf
    • https://static.usrfiles.com/ugd/b8c837_5be36ac1631b4b15bfdcc26c2d20537c.pdf
    • https://static.usrfiles.com/ugd/fb83f1_f0773f2a026e4b26bfb5db3989f1ce56.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8842bec2de24456a8403725306eee8f.pdf
    • https://static.usrfiles.com/ugd/a298ce_1f1d407f08774991805eecc65b362fb1.pdf
    • https://static.usrfiles.com/ugd/63d3ad_a251d2a82dc04c618d1809c164a112a5.pdf
    • https://static.usrfiles.com/ugd/55cc32_8ec43f50e78e49c2b30e3dab88b5a048.pdf
    • https://static.usrfiles.com/ugd/f84671_520eea28b6664821acd47a2f170c6151.pdf
    • https://static.usrfiles.com/ugd/0aab01_aaf96d2998f04ce2beaed827a209593a.pdf
    • https://static.usrfiles.com/ugd/4b7290_dcd6eb65cb23498e87f080b577ae3f09.pdf
    • https://static.usrfiles.com/ugd/f967ac_836ab2bf928f48849d3e09c3eecc1a18.pdf
    • https://static.usrfiles.com/ugd/fb5067_4ab0cedd3cfe469cb54f8ce1c87d1929.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_off000061ef.bin
9e22a119348570e0b9e883d90f0f34e06cf1177add13e1590eaa6c4ea04fd955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EF 5156 bytes
font_01_sfnt_off0000734d.bin
9e30357e5d2c42d46247f7d282e8f7679ede05966d8bb195e3063f4f3520bd6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x734D 16768 bytes

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