Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23a8e15210b7389…

MALICIOUS

PDF

41.7 KB Created: 2020-08-29 07:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f306c36916a0ba6a5e132ebc96cba55d SHA-1: a2bcc85bdaec7220947d9ad0029398ffa544fa16 SHA-256: e23a8e15210b738906da3f2d41aa4c198faefd5c91413ac630f2d14104619fc0
162 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to a URL that impersonates a Firefox download page. This, combined with the 'Browser extension / update installation lure' heuristic, indicates a social engineering attempt to trick the user into clicking the link. The link likely leads to the download of malicious content, potentially malware or a credential harvesting page. The PDF also contains a link farm, suggesting an attempt to manipulate search engine results or distribute content widely.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.com/wix?keyword=descargar+mozila+firefox
    • https://static.usrfiles.com/ugd/b8c837_16faf531a4f64950b50bc12b4349e1cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_95e5cb01b1154f729be73f86dfc0e7f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b0dac275a19442d8585557a980fbff0.pdf
    • https://static.usrfiles.com/ugd/b8c837_35396f3a25dc4e48b77620c942a71c0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e4e60300a364766892853ec9bd7eabb.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b3c90cb8c22434b8852da9e8156bf83.pdf
    • https://static.usrfiles.com/ugd/b8c837_affdca35539d4e3f84b75cf182a391b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_733a67af68dd44c9b4890a2472552336.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9a11ba2a6934f87a27d202fa4456817.pdf
    • https://static.usrfiles.com/ugd/b8c837_45eea6fc25a44ca69e9ed652ba3cb6c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4391f989f0747ad83aa98cfd1849e2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_da02d44ab6c44ed9abcf462c9b92f481.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_off000063d3.bin
421df0458106f1cc4c39b8439e9fcc79f1195565081292c424b3a3d404f4038a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 5320 bytes
font_01_sfnt_off000075dd.bin
3b70e6dc3b9ec2c181184bb3e8abf69ef0f50a4d8880d05058202859ba269628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DD 10752 bytes

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