Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f6dbd788986827…

MALICIOUS

PDF

46.4 KB Created: 2020-08-29 15:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d31233472e60cc5dbdd1bc53e06dcbe SHA-1: 6c17fa5c46950338fef409722e7df6e7e82a5874 SHA-256: 35f6dbd78898682774ef99a49d04cd29f166a9965ce08ef1b2bb415614e2eb57
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, disguised as a search result for 'ecuacion diferencial de legendre pdf'. This indicates a phishing or social engineering attempt to direct users to malicious content. The file also contains a large number of links to other PDFs hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious content.

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=ecuacion+diferencial+de+legendre+pdf
    • https://static.usrfiles.com/ugd/ae059d_6fe68a88314f4c74924fd9607cc8b4f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_52637f0ed32840d0a19be67597a8bf2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb6f0d2e3f224ffdbc54b9370b056c71.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f2b8e7dab6147c78548b4e5b26f0096.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_7951c408ef8b47daa8713980bd5f3cea.pdf
    • https://static.usrfiles.com/ugd/7d21c0_ba5c2f77050c4b5a987e932ee02969fe.pdf
    • https://static.usrfiles.com/ugd/accd1f_4f125edd0e404721a555605db66da74c.pdf
    • https://static.usrfiles.com/ugd/b8c837_84e9cb0a2e9c485fb7883d8ff08fdfe1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b52f3022a3843be9efc311b0479ef3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0af06bc528704f598aac5c91b9f3948a.pdf
    • https://static.usrfiles.com/ugd/b8c837_951fbc97f0314ad6833cd4c16376dd10.pdf
    • https://static.usrfiles.com/ugd/b8c837_dce6b614c31746b3a4c9b72b73c21fbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e04bd0537104fb78929789da62f4ee1.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_off00006860.bin
3ef6b2377617f20e844ae84c3d0821307a9db2030bf137c7a73e02b8a2b0a9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6860 5104 bytes
font_01_sfnt_off000079c7.bin
52b61fac3714bf03b0ce7c4c53954cf03365bf4e7b026883c5c0ffaacc31ce35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C7 15900 bytes

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