Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f80e79b20ba92f…

MALICIOUS

PDF

45.8 KB Created: 2020-08-31 06:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0490ecddd07611d48c4743ea3bca6d6 SHA-1: 5d9f1a0611c6320e7d06a0e6b1b8cdf1c3b752f6 SHA-256: 21f80e79b20ba92fd9e44eaf3060ebc7e821486f3d487e9fa151ec9a53ab28ac
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=ryobi+dp102l+manual'. Additionally, another critical heuristic indicates a PDF link farm with numerous external links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the lure.

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=ryobi+dp102l+manual
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/agenda_escolar_2020_para_imprimir_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/miley_jab_hum_tum.pdf
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/14825527549.pdf
    • https://static.usrfiles.com/ugd/57c819_c6ad78bb46e24e57bf3367ed2eed9210.pdf
    • https://static.usrfiles.com/ugd/73cb9e_23ead0ac11794eb380f6deb5fb2485bb.pdf
    • https://static.usrfiles.com/ugd/09c3c7_6b3a5baa99d048cfb364de5f2876fd06.pdf
    • https://static.usrfiles.com/ugd/15d534_e14c7f26720346d0a27d15f7a07a0863.pdf
    • https://static.usrfiles.com/ugd/b8c837_acc9de464a35427b99cb71e95afca048.pdf
    • https://static.usrfiles.com/ugd/5438e3_b59691fbab0c425ea0f98c281fe121d9.pdf
    • https://static.usrfiles.com/ugd/cfa91a_53c034f30065421f81870f9afbc3ea3b.pdf
    • https://static.usrfiles.com/ugd/5b9a87_24429e5dc7e648e1bd0aa0b0df087c8c.pdf
    • https://static.usrfiles.com/ugd/0f1814_523ff820146043928a176ca61fe07fff.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fb24b56143f48fe9235d6d03ba7d6b2.pdf
    • https://static.usrfiles.com/ugd/834936_5f7532ddcb624a0f93014dd862a10d8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_dff7c2f01dfb49fc867614780af3b1a9.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/
    • https://static.usrfiles.com/ugd/cfa91a_53c034f30065421f8

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072e7.bin
4fe3214453a485bb586a6d864c931b27ccdb2a15809058bbfe8a740d5616bcf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E7 5408 bytes
font_01_sfnt_off0000853a.bin
8f24f85a2de2d7a6b8c5c287ad7c86755088e5f660990be3c05e62dbb252f140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x853A 10768 bytes

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