Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc99bb18b6e47ac…

MALICIOUS

PDF

62.0 KB Created: 2020-09-01 03:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9915f178c937eb312bd67908b1a0234e SHA-1: 4feb9a3d9e14e8f0c5804aabc6060a8ba9d7b019 SHA-256: 8fc99bb18b6e47ac93b1192a39703b3555d046ce9176386d023b3d3b4b79feb2
150 Risk Score

Malware Insights

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

The PDF file contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to an 'audit report' and the malicious URL. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly indicated maliciousness.

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=going+concern+qualified+audit+report
    • https://static.usrfiles.com/ugd/b8c837_f0018bb3149a436194e978a19552e0c3.pdf
    • https://static.usrfiles.com/ugd/90c678_6081251bf4f34ae5a61f7a4ef95a94d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e24ce86c8fa04a588c867cc4fe658ea9.pdf
    • https://static.usrfiles.com/ugd/b8c837_994f6c6b3b334ceca66ad99599072445.pdf
    • https://static.usrfiles.com/ugd/eb6612_1754f7d32287485abcbf3d41499aa1b1.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_bf2230135dcb453c8d04690209a9c62d.pdf
    • https://static.usrfiles.com/ugd/edb4a7_d826c6a5cecd464db0f01d68d3e7e99a.pdf
    • https://static.usrfiles.com/ugd/4d400c_13003cc74d24480084bd8059c7ea5417.pdf
    • https://static.usrfiles.com/ugd/accd1f_af632ea51111411b96d4357126954afe.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_0cc9a701cf7848ebaff6e702419c9ef8.pdf
    • https://static.usrfiles.com/ugd/db93e9_7e75f94c75b942c98a6179a559dfbe59.pdf
    • https://static.usrfiles.com/ugd/b8c837_af3d921be24f4dfd8509b19225a31eba.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_off0000b585.bin
94799a627cc1dfbbcd32ea6f4f00c08df56ef284a1925c1c0d5ad166b73f4ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 5300 bytes
font_01_sfnt_off0000c7a0.bin
44c5cb621c5451be3f1d393ea2890b35fcb2060b51db3246d7f47f5792f29c79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 10720 bytes

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