Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b7f0f3fc60397d…

MALICIOUS

PDF

47.6 KB Created: 2020-08-31 04:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdb538bf51b919bdcca082246ba5c550 SHA-1: 09cdb9fc47d50225a977df0a17ebb6e5007b59e9 SHA-256: e6b7f0f3fc60397d69d729fb538a2fb17b807084d2dc317520af2b2d6dbcd7cb
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=talku+gerador+de+cr%25C3%25A9ditos+criador'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

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.ru/wix?keyword=talku+gerador+de+cr%25C3%25A9ditos+criador
    • https://static.usrfiles.com/ugd/aef5b7_944dd4776b3e40eabc4f840f4bf2638b.pdf
    • https://static.usrfiles.com/ugd/0a51c1_f439ee9dcfb94f01a157d06212fef803.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_1587fa23a839419aae4d5eed8c532a48.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8842bec2de24456a8403725306eee8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6be4d119454488385e544be8e0be150.pdf
    • https://static.usrfiles.com/ugd/40b9e6_3183f5aaeeae42cdbc8cf4ee0f225cba.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_e7e3fb6fe105454eacfaac43e1119dec.pdf
    • https://static.usrfiles.com/ugd/6c032c_bbdfbddd7cbe4a2d9a4fb3e4b7450d42.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d42efe6aacd434b9c959c176c613934.pdf
    • https://static.usrfiles.com/ugd/66c878_b3ac92120bf44412ba4bf622fcb9820d.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/89419708961.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/78359919632.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/79596721025.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8078/files/zomegidi.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_off000077b5.bin
d893ed0f250cd5b9b1f7c06ec2b813eaa25c5a019c73ab67ae12d4f03b7511bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B5 5260 bytes
font_01_sfnt_off00008960.bin
f7fdee8ff6fcaacdbae38029f3161286c1b93978f877d1d570245b922e415ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8960 12424 bytes

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