Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b3bec0969182b9…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 14:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05223bf613f944109ed5b466c0bc193a SHA-1: ec047bb250d05903789c7c0c5392863b750bf109 SHA-256: e5b3bec0969182b93cea719f9462c2b01817b7e05f5edb77be74052ef4be69b0
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text related to 'nj chat rooms' and a URL that aligns with the malicious redirector heuristic. The presence of a link farm further supports the malicious intent of directing users to external sites.

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.cc/wix?keyword=nj+chat+rooms
    • https://static.usrfiles.com/ugd/b8c837_1424bd56622a4d56a1e2ca8feeba0a69.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce0eb75b390749449b9ce8ebc3cee67d.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc4d593d89d3458f8c6ce36337143781.pdf
    • https://static.usrfiles.com/ugd/b8c837_abd580bfb7c341bf91d6c5d42e205d88.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4350b43ae547118527007f65489b33.pdf
    • https://static.usrfiles.com/ugd/b8c837_32e17859efe84569b320a1a9966ec6cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9ae686848544d579930338734846f5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b94b05d034940d8877c2d6facf28444.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/fawemufuda.pdf
    • https://cdn.shopify.com/s/files/1/0434/8405/3669/files/auspicious_occasion.pdf
    • https://cdn.shopify.com/s/files/1/0432/0375/6196/files/disney_finding_nemo_coloring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/xopojazoxutamax.pdf
    • https://cdn.shopify.com/s/files/1/0434/1042/3960/files/nufurinimiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6399/1717/files/gapavezodadod.pdf
    • https://cdn.shopify.com/s/files/1/0428/2017/3983/files/pidiwetoguno.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/producer_consumer_c.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/bluestacks_ad_skipper.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_off0000628a.bin
e8e4e08da6f4e6a2bbc47f68a9a44fbf84df9ac45ad43e2c9e1f238752b09826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x628A 5052 bytes
font_01_sfnt_off00007393.bin
12596212f742124b3e01cb5c4b55c3f65d0e69f49709282f0df09c3365fcab6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7393 9796 bytes

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