Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3385d3415ed1b1…

MALICIOUS

PDF

92.5 KB Created: 2020-08-29 08:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04bd5d10d6c4d1479ad0bb004eef4078 SHA-1: 58e42c22c060cab72d6780bbdb1cbf8c460ccb97 SHA-256: ca3385d3415ed1b1c0a27f35fcb30a902e93d599f74b8b2f3f78a1a16ea80ed2
150 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 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links, many hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.ru/wix?keyword=gareth+whitley+tiler+wrexham
    • https://static.usrfiles.com/ugd/b8c837_97e2640bd1cb497eaffce27b09671eb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_be3586fe336944eb8ca9e74db2528cfd.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c71c59435294bb49a24a87059cfecf8.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/wavexofatexowotetibikad.pdf
    • https://static.usrfiles.com/ugd/b8c837_f47e6561fc184c4ead6c241b649ad407.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3fd4d1c0b914197871449c1b5374d26.pdf
    • https://static.usrfiles.com/ugd/b8c837_62c92dce655a4d91887ee47f0ac6917d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0359343dc87846aa8fcf29998e796332.pdf
    • https://static.usrfiles.com/ugd/b8c837_72f3e7aed4a646a0a6eb583b5daed43c.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_off0001239b.bin
a65a836ad90abac3be20c27398731060590167bfb10ae30aab68ba323a96abd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 5040 bytes
font_01_sfnt_off000134c3.bin
5bfadbf43a67291b307434d54ae946e8e82eb8c96eac1d0411724a8c11c8bee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 15848 bytes

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