Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06b7caab340f1c9…

MALICIOUS

PDF

35.5 KB Created: 2020-09-05 01:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25918b544c4ae0a0d9347a34e9d04aaf SHA-1: dfdaf81a63b9ce0918f143b99f82a993f202d53b SHA-256: c06b7caab340f1c9615d1d6d6e9f72e8091f6b4256e582602ce9c776b03b9df5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a lockout tagout procedure template. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL and text, reinforcing the lure. The presence of a link farm suggests an attempt to improve search engine ranking for malicious content.

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=machine+specific+lockout+tagout+procedure+template
    • https://static.usrfiles.com/ugd/79cb75_fc809f15c9934ac39013c1614c029731.pdf
    • https://static.usrfiles.com/ugd/10b11f_737ac6415a9c4f93b081739cc4f3c299.pdf
    • https://static.usrfiles.com/ugd/b8c837_ece08c7555344e99aad866e4436a7c4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5115728ce64343c68e1683551c93fbcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_277be9e0bb5047dc8b8d9105d319aac5.pdf
    • https://static.usrfiles.com/ugd/286fb8_b7f081a46b7949b8bd5df8d61fc3a063.pdf
    • https://static.usrfiles.com/ugd/cf14a4_ee59d41d3c83458a85390e3c148f7062.pdf
    • https://static.usrfiles.com/ugd/9421c8_2d5a37005599408dbe587cd0030ef27c.pdf
    • https://static.usrfiles.com/ugd/724fb5_b88d1863a2ae468a84c66b55d343d282.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_off00004c40.bin
0772a0d4a5e23aaf1fd498b7096e6abbb7e97fc787f8942dc75980e86b5e3840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C40 5640 bytes
font_01_sfnt_off00005f4e.bin
5bc4b5ebb8146e05fd2b9ead8697d8213fc0e5f283236e4b8ddfd2b547a4a3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4E 9952 bytes

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