Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c37c310eb58e8ec…

MALICIOUS

PDF

39.1 KB Created: 2020-08-29 04:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 977efcf27b2a479428812283ff222688 SHA-1: f38dd2bfd649e0d92000a356082534f92842ce9e SHA-256: 9c37c310eb58e8ec2276efb0f740a1eedb64bb212e2ecc94252ec61b34ab41ac
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used to obscure malicious destinations. One of these links points to a known malicious redirector, ttraff.cc, which is highly suspicious. The ML classifier also flagged this PDF with high confidence. The document body appears to be garbled text, but the presence of the URL in the document body and the heuristic firings strongly suggest a malicious redirection attempt.

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=amazonbasics+portable+bluetooth+spea
    • https://static.usrfiles.com/ugd/b8c837_83f0769e4102485a8a3e32a7e1e7d435.pdf
    • https://static.usrfiles.com/ugd/b8c837_4886c0e0eb1a4362a2a7dab525ef50b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_cad9da7fa409402b9399a38ecaa6359b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a85aa1e089fd48a68b3fad5229d7176d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9284648f0674d97873414254bab00d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_62ead4b5d7db4e8381977a53c9133e96.pdf
    • https://static.usrfiles.com/ugd/b8c837_d34944ebd7a840a1aca28e821e20bf63.pdf
    • https://static.usrfiles.com/ugd/b8c837_f26ee052378b49ab8788594b0c1bd47c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d50b7e52fc346ba9299f91c652bb6f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_67e6f8e56fe944c8902bad339d3ce75f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0250e583e02144f7924434c2d26d83b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6071401020040e89cf7e0f04e877af2.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_off00005a79.bin
cdc2b1bbe689f378ef90b3a9ac19e9fd2226ac248fea78b3adaf2e7e677f7a65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A79 5352 bytes
font_01_sfnt_off00006c7b.bin
776a6a7902ba2015bb8e123399d431143bbe3bdfb2c11967366b4784312661cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7B 10520 bytes

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