Malicious PDF — malware analysis report

Static analysis result for SHA-256 a552d04db1953123…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 19:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be20b4776b948e9c4a8a60081084b9ff SHA-1: 9cf9a71a93b8948e0357d13eeb69905aa6aaa6cd SHA-256: a552d04db19531237eababae24df07dfc2aa887d821386a175ec0815198eb794
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 pointing to ttraff.com, which is a known malicious domain. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicates maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is the primary indicator of compromise.

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=canavalia+ensiformis+medicinal+uses
    • https://cdn.shopify.com/s/files/1/0436/0414/8381/files/61588039118.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/28077434895.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/dalikixekerosajuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9260f1a6cf24047a42953cd10d0ff78.pdf
    • https://static.usrfiles.com/ugd/b8c837_de4b68173cf7430ba8f07f3740fed396.pdf
    • https://static.usrfiles.com/ugd/b8c837_2510d2264deb4f169ffe51de2ba550b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8e06fc5fe7142e8833420b4b276a4ec.pdf
    • https://static.usrfiles.com/ugd/accd1f_7d5516feb0bc46a1b31be142fc5a09d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4beff0f657e540daa5779a85428a28d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_508aafb656344a2093ff5888340e3bec.pdf
    • https://static.usrfiles.com/ugd/b8c837_1512b562c6d04019a44967862eb7b91e.pdf
    • https://static.usrfiles.com/ugd/b8c837_68a5d3c55f344a95a4998d1bb1290c7a.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_off00006120.bin
c6e9984a3b4bc5387d91e6038c990591d424cf1e457a84f8e947d78d07cca7f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6120 5132 bytes
font_01_sfnt_off00007285.bin
755df2e74e71902461cf4f54ffac032081a0bf2f7b49e30595b09c7f36cb680c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7285 10140 bytes

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