Malicious PDF — malware analysis report

Static analysis result for SHA-256 221e81e358485970…

MALICIOUS

PDF

48.0 KB Created: 2020-08-30 12:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53c783937a09de5dcc08b27eed7f33bd SHA-1: 19af9e0b93858888c7821f2944e6daabc9325ab5 SHA-256: 221e81e35848597072ed9ad4b38b52e5e1dd4cc65d58bb00a917630c1e5bfa9b
120 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 with a keyword related to 'sum of solved fractions'. Additionally, the PDF hosts a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The document body, though heavily garbled, contains the same keyword and the malicious URL, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=suma+de+fracciones+resueltas
    • https://static.usrfiles.com/ugd/e3325f_551a993f3f7743bba8aea0e6885ebe3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c600590d24314c688e96f21fb110b748.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbfbe3a0df58405290558e5143e166f3.pdf
    • https://static.usrfiles.com/ugd/d2751c_bc4843006a4344928333709729073a9f.pdf
    • https://static.usrfiles.com/ugd/67f5f7_107564ba3f9e4b43b66b827087d74838.pdf
    • https://static.usrfiles.com/ugd/b8c837_592c1c3478d144b199aeccafc972e01f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea840c07449841309ba662df1533cf19.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c66bee8f36240ab9f0693405fe6d8ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f434805ddda4e75bd6a79c4399aa167.pdf
    • https://static.usrfiles.com/ugd/3cb679_360c1baed5374f03a191ca884d61740b.pdf
    • https://static.usrfiles.com/ugd/b8c837_affdca35539d4e3f84b75cf182a391b1.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_dc07e9d82bde4c319682434d9f01e566.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_off00006f0c.bin
a83b3f84efe2fee5bab15fc6d444b15a11e2f79168451326b87ee486a3b811a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0C 5272 bytes
font_01_sfnt_off000080d8.bin
637675d1d9d3b101b381dd2283c999d0b33b2babf3d89f542bacf8dae242e508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D8 16368 bytes

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