Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f27b84e67b366b3…

MALICIOUS

PDF

40.6 KB Created: 2020-09-02 19:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8f7f57ffb73e8b62b820684640d8861 SHA-1: 66c2f9b7792c07277f795269009cea3b8ea9041e SHA-256: 4f27b84e67b366b361b26a306d0ea07c4347e671ef8b58db681c8501fc06bc5c
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=naming+acids+and+bases+quiz+answers'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The file also contains a large number of external PDF links, characteristic of SEO link farm techniques, with many pointing to static.usrfiles.com. 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.me/wix?keyword=naming+acids+and+bases+quiz+answers
    • https://static.usrfiles.com/ugd/d51d36_9c3f061e31844e29b683aea01fb7c424.pdf
    • https://static.usrfiles.com/ugd/96768c_39305ea2d8824986b33987689f9748c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_20d82a16a88e4f5791e57b7def2b1a52.pdf
    • https://static.usrfiles.com/ugd/b8c837_5689eced90bd429ca9020d6800e11d52.pdf
    • https://static.usrfiles.com/ugd/8ab72e_29350989d2d54ca6af3ad7b8bf8380ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_62554cc13aa845dcba8afb20289ed26a.pdf
    • https://static.usrfiles.com/ugd/fe0276_e7e54cd4c3b04328ad6dedad6cfcb7eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_96d04563b91e43d4904875a785eaa00c.pdf
    • https://static.usrfiles.com/ugd/963627_5b1856d398e14e5eaf04f297deee2eef.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_4e3bf32afa844a099ef3c3f9c3a25f69.pdf
    • https://static.usrfiles.com/ugd/b8c837_f27b1b26760645159a8becefc4c798b6.pdf
    • https://static.usrfiles.com/ugd/defcb2_07a9c346adfa411d9321bf0077babee8.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/87730751616.pdf
    • https://cdn.shopify.com/s/files/1/0435/2802/8312/files/pitolapalekosakiti.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/fekitur.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_off00005f5b.bin
af79d3a2064fa1c040c4fade62b69aea4fea9a8510d6885ea991f035a4b18dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5B 5604 bytes
font_01_sfnt_off00007268.bin
1b70eda0342ee6c24c97551af92295236580afce2eb71cdc0bdca1d6a60c037d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7268 10272 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.