Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee88d50fa51f22cf…

MALICIOUS

PDF

36.2 KB Created: 2020-08-29 00:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb6ef7e6a400e6db0a5de180372fc1b6 SHA-1: 3d2eaa6f0a80a32b1ae2caa270fb911d2571ca40 SHA-256: ee88d50fa51f22cfc00183cb65fd34f3b3ecad182ed50d93efd06241f3bf0e70
150 Risk Score

Malware Insights

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

The PDF was identified as malicious due to its inclusion of a link farm containing numerous external links. One of these links, 'https://ttraff.ru/wix?keyword=epithets+in+the+odyssey+book+9', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to a malicious site. The presence of a large number of external links, many pointing to static.usrfiles.com, indicates a potential SEO poisoning or link farm tactic.

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=epithets+in+the+odyssey+book+9
    • https://static.usrfiles.com/ugd/b8c837_44b0347737ab4394b3e02defa38c2303.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee60ffe794b9420398a5a1d2f0fbddd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_6542bf75d93e4f9884e5f9a695438c2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e24d915b7adb4a728f09d69b917fe139.pdf
    • https://static.usrfiles.com/ugd/b8c837_54d4cf8d3a224de9b0cee851fed2f3e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_106e6909ea0846108d2dba3fb7322356.pdf
    • https://static.usrfiles.com/ugd/b8c837_7955433ae3c6467c940f2973aa63a031.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c7005fbcfba4d9e8714414bc9b18814.pdf
    • https://static.usrfiles.com/ugd/b8c837_e59049d69c4b45eb975085bc52814b9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef64db22aab343f0991277b148a2d49d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88d344323bb46cabc741122bd7c87af.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d1ed76fca7e4ad2a73be0d247009277.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad69518613604b57992494a838919344.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9a294d52d2842509db1068188766ead.pdf
    • https://static.usrfiles.com/ugd/b8c837_63d74fb18a554f81931d84a70dbeb211.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_off00005116.bin
e89e045ffcc7e09ac4cffa55acfdf3292343b37459ea841d6dec2c7dd3c61aa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5116 5128 bytes
font_01_sfnt_off00006285.bin
246d08e152e55e7c01930f709ee7e5f419d1be0fc8a259524a5fc4066b0617ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 9864 bytes

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