Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9a2d283cf8c4cf…

MALICIOUS

PDF

42.8 KB Created: 2020-09-06 03:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e0857717ea43c6bad02cb45e0485218 SHA-1: 944c314e73c7f6088ea9365763a6e4765788784c SHA-256: 4b9a2d283cf8c4cf0b9d83d84a2b922416de6417c04ea73d697fb17c5273c538
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing to a URL that appears to be a lure for educational materials. The document body, though heavily obfuscated, contains the same malicious URL and numerous other URLs hosted on static.usrfiles.com, suggesting a link farm for SEO poisoning. The primary malicious URL is https://ttraff.me/wix?keyword=algebra+eoc+practice+test%2523+1+answers+work, which is likely used to redirect users to further 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.me/wix?keyword=algebra+eoc+practice+test%2523+1+answers+work
    • https://static.usrfiles.com/ugd/b8c837_bf61f774c19b443a903950b9e101538c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a45926fb051d41e8aacf8757528a5a29.pdf
    • https://static.usrfiles.com/ugd/b8c837_3fa25da6bf5a4505b3237764e479252f.pdf
    • https://static.usrfiles.com/ugd/3bcfef_61c6bb6ea847446b89e3eaa32a1efd62.pdf
    • https://static.usrfiles.com/ugd/ebc5f9_4c3a7ffcaabd42f99234126635acc1a0.pdf
    • https://static.usrfiles.com/ugd/a4d998_ff18225e12024a1ca3e39e480f1411a8.pdf
    • https://static.usrfiles.com/ugd/756799_e94b74df38154ab2836351bfa1ae03cf.pdf
    • https://static.usrfiles.com/ugd/7041e4_8c03f5c575e84e12a2fbb8718968bb08.pdf
    • https://static.usrfiles.com/ugd/353d00_0fd1a872a978476596d4c4f269d0310c.pdf
    • https://static.usrfiles.com/ugd/4725f1_4e05df8066b245228dc22b3f15b6da29.pdf
    • https://static.usrfiles.com/ugd/97634b_e1e6ae5801224403906b47866d6b0384.pdf
    • https://static.usrfiles.com/ugd/7f46b5_0fd80eb0f45a49e5a0107133c86dbe03.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac3.bin
aa6a912aa0323b03db6207c0110404605755775dbb6e75e407885e2c1e1d5185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC3 4912 bytes
font_01_sfnt_off00006b7f.bin
f00106c2c762547ac6e7e6425c2636b5bc5942e4f4fc5496cf17b294f5a75e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7F 11112 bytes
font_02_sfnt_off00009066.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9066 4324 bytes

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