Malicious PDF — malware analysis report

Static analysis result for SHA-256 7923c56058e3a99b…

MALICIOUS

PDF

48.6 KB Created: 2020-09-06 14:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b34bde8af4b65598cf98b46a21fc6735 SHA-1: fc332060cba1cd325431d248b4c5f9b758d1aeb2 SHA-256: 7923c56058e3a99bac65ed71f92f41f014bcc89c8bbd592f2b9579dae7b7e591
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.club/wix?keyword=analogy+phonics+pdf'. This URL is presented within the document body, disguised as a link to an 'analogy phonics pdf'. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=analogy+phonics+pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/vebakowibefos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6140/files/dodifumawumujodijinuwobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8695/4140/files/jobam.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/29131656052.pdf
    • https://cdn.shopify.com/s/files/1/0433/4023/4902/files/zemomidedoti.pdf
    • https://static.usrfiles.com/ugd/a107db_5a7fcf7bc2554495a5bf017895361d19.pdf
    • https://static.usrfiles.com/ugd/b8c837_562e81ae86154ab694cdfe1c0b6927bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_2715550b621f498fa91be0e05fa707c6.pdf
    • https://static.usrfiles.com/ugd/4fea5c_fb1608e7b4e24d898c02d93f7f6f7d11.pdf
    • https://static.usrfiles.com/ugd/a421e3_09af0ff3a515447597044731ee4a1fa7.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cefc7238c4540a884b66f684e1a503d.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/basugogigarerebid.pdf
    • https://cdn.shopify.com/s/files/1/0436/8403/6761/files/50121141356.pdf
    • https://cdn.shopify.com/s/files/1/0439/4100/3432/files/dajigiguba.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2037/files/92575201192.pdf
    • https://cdn.shopify.com/s/files/1/0437/4682/0245/files/barbie_songs_lyrics.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_off00007581.bin
3960f566c651841324b4a1fb7c6ad6472ff3fc567f25ab29804ca49f97883f28
pdf-font-stream PDF embedded font (sfnt) at offset 0x7581 5004 bytes
font_01_sfnt_off00008675.bin
b835821c3d6064568f6daed272b98cc21e04ef50e265a958596d93fc9e3b10cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8675 9680 bytes
font_02_sfnt_off0000a783.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA783 4324 bytes