Malicious PDF — malware analysis report

Static analysis result for SHA-256 b685cd9d6f3072cf…

MALICIOUS

PDF

41.4 KB Created: 2020-08-30 08:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04dfad71a7b47c12ffd0ceefb0f5064b SHA-1: 93256d06f42d6d8bbf4f90d21a8d9119d31daeee SHA-256: b685cd9d6f3072cf7a116f623d04e54a95a2b5a8685c4464fd4eb2c07879582b
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as educational content. The document body and embedded link text suggest a lure related to '6th grade math staar test 2018 answers'. The primary malicious URL, https://ttraff.com/wix?keyword=6th+grade+math+staar+test+2018+answers, is flagged as a known malicious redirector. The PDF also hosts a large number of external links, many of which point to static.usrfiles.com, suggesting a link farm or SEO poisoning technique to distribute the malicious content.

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=6th+grade+math+staar+test+2018+answers
    • https://static.usrfiles.com/ugd/0779a3_631cf75856474463a989baf79cc73b66.pdf
    • https://static.usrfiles.com/ugd/b8c837_de84b0372ee94273bc50965e0f4c71ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ac3ee028dd74febb13802a87a7de7f6.pdf
    • https://static.usrfiles.com/ugd/f84671_79186f68064d44b38cf02d5ccb4fc432.pdf
    • https://static.usrfiles.com/ugd/eda9ba_09deefe3f7104deda7a4b14217fd6a3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_76426c93836a446db7be881da02757fc.pdf
    • https://static.usrfiles.com/ugd/ad2ade_ac8969bdab7f4b5fb502c9f0d8129457.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e124e27a9ad40eaa2c231729b4f7778.pdf
    • https://static.usrfiles.com/ugd/289c5e_47bc3997f4fc4e1b96520cd8053848f7.pdf
    • https://static.usrfiles.com/ugd/a4e402_b3344c4b3ab2454a9bfbb0d074826ed1.pdf
    • https://static.usrfiles.com/ugd/b8c837_255a84215a284ca88d45dcb08a210a2e.pdf
    • https://static.usrfiles.com/ugd/b58d21_947b3336adf44dd2a6b18548ae7f9393.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_off000061c9.bin
d802d6d8533daa24421ec924c3d30c8efe907cde6f240ea78316abbeaf30e4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C9 5880 bytes
font_01_sfnt_off000075b9.bin
9e215f57563e341120da3db88d27e35bbdbf27b047458c9b3a157646b773ba24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B9 10300 bytes

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