Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e84b50f7a1c5b4…

MALICIOUS

PDF

33.5 KB Created: 2020-09-01 16:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63684c697159891e3caf6bf72f494c37 SHA-1: fa8fb83f95d96f3e5acaee16920e0b51ccb92cd7 SHA-256: c5e84b50f7a1c5b4e728f6901d92f1b57bf9cd47513c04b0f451345a624bf991
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/pify?keyword=ib+mathematics+textbook+answers'. This URL is presented within the document body, disguised as academic material. The PDF also contains a link farm heuristic, with numerous links to static.usrfiles.com, suggesting an attempt to obscure the final malicious destination. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.club/pify?keyword=ib+mathematics+textbook+answers
    • https://static.usrfiles.com/ugd/a44510_931d4fea3d364c969437e1a6ed1fe67d.pdf
    • https://static.usrfiles.com/ugd/b8c837_15d5a2bcce5648acb1eb6306d6485cc6.pdf
    • https://static.usrfiles.com/ugd/bf650e_98be0a091087456e8228a2aab4482158.pdf
    • https://static.usrfiles.com/ugd/3d0627_7d40db3df59147f8bd105b5154bab296.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_24a63c029c694fc199b092867bbbf0a0.pdf
    • https://static.usrfiles.com/ugd/d01287_1d2e1757bed14c0d9cb4c1416631723c.pdf
    • https://static.usrfiles.com/ugd/f103bb_8a95a2a4adc7446eb00801f8f31068e3.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_026b681c1ee04395b5d48a10e43fb3d3.pdf
    • https://static.usrfiles.com/ugd/238140_4a2d2333075d464886dcd3ea3e44089b.pdf
    • https://static.usrfiles.com/ugd/bca722_1e65dd83613f442c955f33abc6987ad4.pdf
    • https://static.usrfiles.com/ugd/bb13a2_38548782cb2949d185049a49a30fc2e8.pdf
    • https://static.usrfiles.com/ugd/64d889_e09231ccb789464d8caf8b5b21e4c913.pdf
    • https://static.usrfiles.com/ugd/a2e20a_fe63c3422d2d4abc9f1c02611e0346b9.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_off0000433c.bin
17361cb8a68d318af7a3c6a4f42183f262e4adb99c9dea16856b1ed8d9cd2595		 pdf-font-stream PDF embedded font (sfnt) at offset 0x433C 5308 bytes
font_01_sfnt_off0000552e.bin
82202a99db310eede92838c9778079ee6f7420993e88d01de4752928e6315489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x552E 10264 bytes

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