Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32327a7fb2f2ee1…

MALICIOUS

PDF

43.1 KB Created: 2020-09-01 09:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9243a4b40cc9ca17919f434b00ff6595 SHA-1: ef86ad1baef90e3c3d788098a71bc63f8310fd8b SHA-256: d32327a7fb2f2ee111cf2bdc0a37b4ae37a1dad69f27376bfd60b8bed6c01b96
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'cheat sheet'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing attempts. The presence of numerous links to external PDFs, many hosted on static.usrfiles.com, indicates a link farm or SEO poisoning tactic to distribute the malicious PDF.

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=vim+insert+mode+cheat+sheet
    • https://static.usrfiles.com/ugd/0ebc1f_85e2c89f01094476a95532375ff5ee12.pdf
    • https://static.usrfiles.com/ugd/8127dd_20671357b1b345f689ac81806a09d3a9.pdf
    • https://static.usrfiles.com/ugd/c3f88d_340e6369076e4c8e8d4c3e3742aa951a.pdf
    • https://cdn.shopify.com/s/files/1/0432/8990/3259/files/deforuxegol.pdf
    • https://static.usrfiles.com/ugd/69b86f_6ea13e9695494c0b9bbc14a09a9154df.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_1c4267ccf1f748fe8566335ce518723d.pdf
    • https://static.usrfiles.com/ugd/5ed537_0c8645d5eb4647c183a11d67c95e45e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_068a811298414bb195d63cb92190107b.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_8ad9946967bf4d969a857f52bbce0b53.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_off00005c1c.bin
6c3029323661a8af12165576bb3d6ce145654c1876eafc7adff199e2a6640737		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1C 5112 bytes
font_01_sfnt_off00006d58.bin
e6beb635631407071575303b978abaebc4fa51dd7f05eaa5763b19379c1d781b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D58 16152 bytes

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