Malicious PDF — malware analysis report

Static analysis result for SHA-256 504ac121e05e8b4f…

MALICIOUS

PDF

59.0 KB Created: 2020-09-03 09:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab04c9365ea8fd3df794309ba3c61572 SHA-1: b3e80d457d48be7632f2a247c14b1c690fc24594 SHA-256: 504ac121e05e8b4f8c2895138e340d3c1c2c9f68f7074e04578455f9b782eaa9
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, disguised with a keyword related to Kendo UI MVC editor templates. This suggests a phishing or social engineering attempt to lure users to malicious content. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.me/wix?keyword=kendo+ui+mvc+editor+templates
    • https://static.usrfiles.com/ugd/b8c837_e6a1dd58cfee42ee9a569df62f8afcd9.pdf
    • https://static.usrfiles.com/ugd/82e28d_8a2de0c87c234fd1a5d4c5fe56f980ee.pdf
    • https://static.usrfiles.com/ugd/9374a7_4ae17d7841714e53b7adaebc977bfd55.pdf
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/slackware_iso_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6550/6966/files/29706714730.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/basic_probability_examples_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/matlab_for_engineers_3rd_edition_solutions.pdf
    • https://static.usrfiles.com/ugd/cfa91a_11f22a3b38384a048514420626e256e3.pdf
    • https://static.usrfiles.com/ugd/dba42a_8e4226f5f8d54c6e8747cfe11bf24501.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009704.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9704 2828 bytes
font_01_sfnt_off0000a0fe.bin
87202e87d52dd7077588858528e00bacda081b8fc03802f97034edba1fbb189f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0FE 5248 bytes
font_02_sfnt_off0000b2c3.bin
ca1bda5b33542d2f860fd327f79fef29d02fc03211fa8c99a0bcc81442410de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C3 14188 bytes

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