Malicious PDF — malware analysis report

Static analysis result for SHA-256 9722a8164a71059f…

MALICIOUS

PDF

45.5 KB Created: 2020-08-30 23:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0349ed0a6d0811d79da35e3ed70ef6e7 SHA-1: e324f12aa718875ea408d24d96a17857e5b3a8a2 SHA-256: 9722a8164a71059f0704a2c1bb457ff57e430d5b1350ce104ed0204e570163ff
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, directing users to `https://ttraff.cc/wix?keyword=interior+finishes+schedule+template`. The document body, though heavily obfuscated, contains this URL and appears to be a lure disguised as a schedule template. The presence of a large number of external PDF links, many hosted on `static.usrfiles.com`, suggests a link farm or redirection strategy. The ML classifier strongly supports the malicious verdict.

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.cc/wix?keyword=interior+finishes+schedule+template
    • https://static.usrfiles.com/ugd/b8c837_8e8dc1c3d41843349c66fd4d5ca0aa5b.pdf
    • https://static.usrfiles.com/ugd/93971e_c24d140d24d74c1d96a616c59e1d555d.pdf
    • https://static.usrfiles.com/ugd/2b3f46_0828f964b30c4ac181d19bb9ab697904.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b6c745be44b4880b4906a0e94e2621d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1948a1f182a64a24bd371e375ea045b1.pdf
    • https://static.usrfiles.com/ugd/b9801a_84e15ab2593a4f88a7449cceb1fe151a.pdf
    • https://static.usrfiles.com/ugd/b8c837_681f2cc7fc5c4ddc8bff164975e67588.pdf
    • https://static.usrfiles.com/ugd/b8c837_b818b6c3533a4e4dbe5128b69367856b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cdbed962a9649b3a0cd35f01edc3f89.pdf
    • https://static.usrfiles.com/ugd/b8c837_768799232fe64d4eb1ea42bf39b28721.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_e52a1372b39442d287d4cfad67aea20f.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_off00006617.bin
6355b72548f023fac9b1bf608d974640bb7768ec7e73f55ecca73474e37547e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6617 5212 bytes
font_01_sfnt_off0000779d.bin
0efbd1e0db979af2b51dcfca660a322759e1100c69bb2344dc4f9de6b1a99c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779D 10676 bytes
font_02_sfnt_off00009b65.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B65 4324 bytes

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