Malicious PDF — malware analysis report

Static analysis result for SHA-256 616ef662a8eb15f7…

MALICIOUS

PDF

36.1 KB Created: 2020-09-08 20:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1816adf67530e82631a35d2a36b895ff SHA-1: 67e822aa06b6e5e9d55c66704a7cac54844f06f3 SHA-256: 616ef662a8eb15f7e48e36ec1b7e4aa7903d5a232952680d55299c44d9c2858a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary heuristic indicates that the PDF is a malicious redirector, attempting to lure users to a malicious URL. The document body, though heavily obfuscated, contains the suspicious URL and references to other PDF documents, suggesting a link farm or SEO poisoning tactic.

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.me/wix?keyword=5+point+star+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/79e0dc_45ac106f9ad8484c8d739f896bf72159.pdf
    • https://static.usrfiles.com/ugd/bcb9fd_75f57a0188044d0ea2be1dad3957fdf2.pdf
    • https://static.usrfiles.com/ugd/f103bb_9b1ec88c67a74a6bb5d42cb1a17b7c44.pdf
    • https://static.usrfiles.com/ugd/b8c837_454c95fd0a604b3882c7be149f681a3a.pdf
    • https://static.usrfiles.com/ugd/3649d2_8a6d8ecdfdc74d3a9b20c0f3b5483b61.pdf
    • https://static.usrfiles.com/ugd/b4609a_d478126da2384b1387e307acb4cd50eb.pdf
    • https://static.usrfiles.com/ugd/c268f7_a841e22ccf334b09952aefb4661d8823.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_7f537a3c0fc648448e0f8a7cc9591d46.pdf
    • https://static.usrfiles.com/ugd/90423f_fbbf2a4e8f5746268012a3a5a5433263.pdf
    • https://static.usrfiles.com/ugd/3dd68e_3c0cdc308cf54214b03704e3d55dea04.pdf
    • https://static.usrfiles.com/ugd/c63bf9_6460a5b1ca76453ebd490c63ab1c2c45.pdf
    • https://static.usrfiles.com/ugd/bf0735_491a741e646943de88b97a744728ac07.pdf
    • https://static.usrfiles.com/ugd/cc10e7_4941f00020da4f5699d4bcdfe1fd332b.pdf
    • https://static.usrfiles.com/ugd/575363_2720d174143d4bd6a42ceaad20b64bbb.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000522e.bin
6a9f13c6caf49c24dc17a1890276c80ce16d9d1f44b7e69ec2a8ea197cfababf
pdf-font-stream PDF embedded font (sfnt) at offset 0x522E 4996 bytes
font_01_sfnt_off00006311.bin
5adab70e2f03e8e2afc01eeeeda753a09006591c461527ccc9aec99250735746
pdf-font-stream PDF embedded font (sfnt) at offset 0x6311 9668 bytes