Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b8bdc31b9c4af3…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 06:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 717fc5101a71f9c367942f9d1da23e78 SHA-1: bfb975f3bd88a57ec13d3f331e5407d9173f71a4 SHA-256: 31b8bdc31b9c4af3ec4500443a84fff364429860d8425047da8d06e51c5b629e
120 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, pointing to 'https://ttraff.cc/wix?keyword=tecnologia+de+grupos+pdf'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDF links, suggesting a lure to external content. No scripts were extracted, and the primary malicious activity appears to be redirecting the user to a potentially harmful site.

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.cc/wix?keyword=tecnologia+de+grupos+pdf
    • https://static.usrfiles.com/ugd/ddb60a_8168549118ca4d4186fa3dcd4cd4aaba.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e67156b404d4e84b9a943e3778bc25e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a780f57ea863475ca22299a17a996c91.pdf
    • https://static.usrfiles.com/ugd/f0f215_2d53247d1fc046c596514b1fd96b09ef.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/zosasedezefubisuluzaji.pdf
    • https://static.usrfiles.com/ugd/565485_9b46d18106f541ae98ac7e024c850f51.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c00d0d0797c4653b174009bcae3e607.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e549cd80b714a3b94fd25af501a2815.pdf
    • https://static.usrfiles.com/ugd/b8c837_92488ebecacd42a48bb8969f0ff89d03.pdf
    • https://static.usrfiles.com/ugd/36f25b_dfd276c6e9ef428f8979f17c03cb6f8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9c4ddd1fcf14e5c8f4eefad11cccdba.pdf
    • https://static.usrfiles.com/ugd/b8c837_0033ea4452db4d5b989bf92049294be2.pdf
    • https://static.usrfiles.com/ugd/b58d21_75fce2575f0f452bb50dc970c541313c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a15e2bb99a464cf48c44de4e05ca7842.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_off00006319.bin
e3d2c3dbf14a25befb0a4ad4b6f17595132bf1c8d524e7e857753ce9923171b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6319 5272 bytes
font_01_sfnt_off0000750b.bin
59dedb90e0cbe2b1b58a78fa46947b5baeb26ab87e38194830b2f12f85c0b5e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750B 11664 bytes

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