Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26930d40e126fa6…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 16:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfb3cd9d8f2c80cb30f51616e662047f SHA-1: ea6a086ce3e9c2e69b7b987fa3aecf0ef6d8a2e8 SHA-256: c26930d40e126fa6a74de9a69d80496851a55aa2f12b8cc1eea7627e2ce005e6
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=kamasutra+20+posiciones'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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=kamasutra+20+posiciones
    • https://static.usrfiles.com/ugd/b8c837_20ab9e3434b9488696e45fb2f4ae2c75.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e3a1a91089740da936be81dd4e13c1d.pdf
    • https://static.usrfiles.com/ugd/902d29_4b31e8c6930f437983c1bac8d600c495.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/inorganic_chemistry_miessler_5th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0465/5372/7126/files/guitar_lessons_for_beginners_dvd_free.pdf
    • https://static.usrfiles.com/ugd/6da380_0a0b316f3bb64702b71aca4823a1b675.pdf
    • https://static.usrfiles.com/ugd/6c98bc_2a8bff338d904ef4bf7aab30bb202eff.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac61a5e1d5fd4a6b82ba4f5482162c36.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a646338c86f4a83885676201460208a.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1fa28cd7f804cd38c43bbb6839a87d2.pdf
    • https://static.usrfiles.com/ugd/87a178_c33349a7824b48c4979aea1460a70123.pdf
    • https://static.usrfiles.com/ugd/a107db_6c90f0560aa14829a47611f0a734051b.pdf
    • https://static.usrfiles.com/ugd/4bb894_3909a1091a2d4703997eedfae65ecac4.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_off00006921.bin
905537602afd77e124c08d941002ee21ebe2a8f2bd28f3016898f467892b912b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6921 5292 bytes
font_01_sfnt_off00007b04.bin
85fb5b7fc8a3829de950e334146bc965fa0f20fcc0f991ffb051b64441adc8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B04 10368 bytes

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