Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ea20937050681c…

MALICIOUS

PDF

68.0 KB Created: 2020-08-30 18:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7a77a9bdfcbcd91f6a2057f6531ffcf SHA-1: 45e2f4e3318a8a8ebcf18b3de5ace018f90af5a7 SHA-256: c1ea20937050681c005450797d98c6e377e99c5f254d92abf7e1d9961c13724f
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic firings indicate the PDF is designed as a link farm, likely to distribute malware or conduct phishing. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious IOC is the redirector URL: https://ttraff.com/wix?keyword=n%25C3%25A3o+fa%25C3%25A7o+mas+nada+o+grande+combo+let.

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=n%25C3%25A3o+fa%25C3%25A7o+mas+nada+o+grande+combo+let
    • https://static.usrfiles.com/ugd/69b86f_899e4c81640142bbb094a1c2e25c633d.pdf
    • https://static.usrfiles.com/ugd/5af86b_00e001bb6ef64a06baf7fed3ed802905.pdf
    • https://static.usrfiles.com/ugd/902d29_d1386b0728844c5d84b6705c8a3b9202.pdf
    • https://static.usrfiles.com/ugd/6f53d7_3cbcc7d08d474fd2bebe4c7e746302cc.pdf
    • https://static.usrfiles.com/ugd/89363e_a1725e2bf4e043db9bcbfecfd6539ae4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18842325712.pdf
    • https://cdn.shopify.com/s/files/1/0464/7138/1160/files/guberazawid.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ce17a5bc9894ade9b61c46011f498d2.pdf
    • https://static.usrfiles.com/ugd/b85eb0_305dade8ea704cada68be68dd8d938f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cbaa84d9d7345cf81a4212289ed7854.pdf
    • https://static.usrfiles.com/ugd/18f527_cad1254b208842c2bd35ad4753bdb161.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b6a671e68074d0092aa7839ba5754c4.pdf
    • https://static.usrfiles.com/ugd/20d83a_e6672cc9ce844f648f2d95f0fa7954f4.pdf
    • https://static.usrfiles.com/ugd/f96b02_85d923eb5dfa4460aab9cbdef6ebd360.pdf
    • https://static.usrfiles.com/ugd/b8c837_02be4e9ddc814943ae020a14cdcfa3df.pdf
    • https://static.usrfiles.com/ugd/0049ca_6b139639d3254f21a61a35493575e6b3.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_off0000c5e9.bin
f468130cfc5ae3ff165d409e3bc2f4f881ff2b3ba994b113670ec00c0682dc08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 5952 bytes
font_01_sfnt_off0000d93e.bin
0d96f5615c1a0fdf85f1011e22470f48ce4c8ceddaa7be6b6b98452bff1a589e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93E 13000 bytes

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