Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a742bd635d52bb…

MALICIOUS

PDF

41.5 KB Created: 2020-09-01 11:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0a9faa62f15179e5a45137ee0d886f0 SHA-1: e8829cec8389cb6031c371485de6bad5806ecbc3 SHA-256: 25a742bd635d52bb0a52407f1b75c891c47540d217c0954ceadb2880fa2f8b27
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a link to a project presentation. This indicates a phishing or malware delivery attempt. The PDF also contains a large number of links to external PDFs, suggesting a link farm or SEO poisoning technique to increase visibility. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=online+examination+system+project+ppt
    • https://static.usrfiles.com/ugd/b8c837_ce6250a253c848d9bf17ad1eedaefbd7.pdf
    • https://static.usrfiles.com/ugd/4dd980_b0226762c0d945d8a1b32c0931b475a8.pdf
    • https://static.usrfiles.com/ugd/a838c0_4f900eac0e444d5bba2f3159dfd7c3b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_f329b5f7ea484bd3ab3e275ced572be1.pdf
    • https://static.usrfiles.com/ugd/b4a829_3eaa1697ffb848c19686ebb3b613b88d.pdf
    • https://static.usrfiles.com/ugd/0dd040_2c541cba6947450f92dcd68ce1288185.pdf
    • https://static.usrfiles.com/ugd/2c7c49_b254328ee3e64d8e963469ff5b092bf9.pdf
    • https://static.usrfiles.com/ugd/19ce5d_eb143453bfea48fd8911ba42f3a8bec3.pdf
    • https://static.usrfiles.com/ugd/3aca14_0ab9f0ebd3554343b473e66f984d2398.pdf
    • https://static.usrfiles.com/ugd/917232_0f9dca6a9d094f968fc842c4d077ec50.pdf
    • https://static.usrfiles.com/ugd/fdee49_13d6a6713bbf430d8261e9e6d6d5f257.pdf
    • https://static.usrfiles.com/ugd/c1615c_7360bbaf73ae41e886d9d771a0bd3a80.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_off00005593.bin
42b79b248e1fd0147e1a04a6f6ded015145d8751e8360d49c8bfd0d151370159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5593 5352 bytes
font_01_sfnt_off000067b9.bin
49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B9 2140 bytes
font_02_sfnt_off00007193.bin
33b93d90687020ef6927447df6e07593a98a0815c35dac2dfa21e67dc3fb0187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7193 11064 bytes

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