Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b500c62a610f65e…

MALICIOUS

PDF

67.4 KB Created: 2020-08-30 11:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d190438311c200f659ae7a9adcb4da13 SHA-1: 23c5402d93cce21bbd6243cbcb882bb053fcd1ae SHA-256: 8b500c62a610f65efe180761ca9221549536ad5323db325628afed6e33fb6f99
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=disolucion+y+liquidacion+de+sociedades+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The embedded document body, though heavily obfuscated, contains the malicious URL, suggesting a social engineering attempt to trick users into clicking it.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=disolucion+y+liquidacion+de+sociedades+pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8918/files/public_finance_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/22666711843.pdf
    • https://cdn.shopify.com/s/files/1/0439/0230/4408/files/33855406948.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5e07f0d016147b8b28ddc512b72ef60.pdf
    • https://static.usrfiles.com/ugd/67f5f7_abe5928f69da42abaa3ba12a5de1d584.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_a0f6e96b782741e5adf358821ce547c2.pdf
    • https://static.usrfiles.com/ugd/097bd5_5a5497b963464448b8fc839529ced0c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f64b48ba92745fcb58da6a16f35c53d.pdf
    • https://static.usrfiles.com/ugd/54fa57_dc24c729a59f409bb9f95168abcca53e.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_off0000bca4.bin
9aa3423e41c6654dcd06207d42e7960486b5c2169ecb3d81fe31f6684cf6149c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA4 5280 bytes
font_01_sfnt_off0000ceb1.bin
4a3736be10d40c11741245a3cb311f9e9c8154d370f9f4db2352fc41f120c7b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB1 16048 bytes

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