Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c35447c1a71ebde…

MALICIOUS

PDF

35.9 KB Created: 2020-08-28 20:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23b79fc99bffa9cf99e0d5108078b1a9 SHA-1: 4c2132bc1ce09fce16673c54812b5ac2915806bb SHA-256: 1c35447c1a71ebdeb6592d797da4a23ea6a13ab7fa670b220fe801cee27207b0
154 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, specifically pointing to 'https://ttraff.cc/wix?keyword=estadistica+matematica+con+aplicaciones+freund+pdf'. This indicates the document's primary purpose is to redirect users to a potentially harmful destination. The ML classifier also strongly flagged this PDF as malicious. While the document body contains garbled text, the presence of the malicious URL is the most significant indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/wix?keyword=estadistica+matematica+con+aplicaciones+freund+pdf
    • https://static.usrfiles.com/ugd/b8c837_c932625d6e78453ca8ecbc84a2ade8ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_52c0aabd9ede4b29a95bcca3a3c3fed3.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd09c383339a480bb46b21b5c0a4a224.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9d6be1a28a548239a37b2455aadb723.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/datarixigaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/13246832716.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ff37e4a526f42fd805e670bfd6c74ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_23a055ba82364faa9aee6e7df11a00e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_20de3a8b3a7c429c996668ffc80d8e8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d224297b83204df286bf3ea34a045d72.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_off00004b1b.bin
9a4147a560869502224c72f77cf6207ddc3e6c682970ac4001d0d3e9111fb807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B1B 5256 bytes
font_01_sfnt_off00005cdd.bin
d8083231cf6951074a0cdb8e090da11330bbdebdbb1bf7951a7444d85ee2ff42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDD 11032 bytes

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