Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31b87bc63db76a9…

MALICIOUS

PDF

48.2 KB Created: 2020-09-07 00:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 653fb042260e37694bac486fb5696485 SHA-1: 44753e0042356709428b59706dff5fead8a9f5dc SHA-256: a31b87bc63db76a94851fb2a6ff9126b2120e6fecac35257da2377535282bda2
120 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=answer+australian+pronunciation'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. No scripts were extracted from this sample.

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=answer+australian+pronunciation
    • https://static.usrfiles.com/ugd/b8c837_e4b04af9a61a4a1baa7d41cb89037e9f.pdf
    • https://static.usrfiles.com/ugd/185c00_d045753ca31c4462994dfad3f09275f5.pdf
    • https://static.usrfiles.com/ugd/455f95_c769120d0812495f8fe83ac02cb8cb89.pdf
    • https://static.usrfiles.com/ugd/e4ff69_b1e5fdb128b84019a9b6b90b36fcf01a.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/inferring_character_feelings_worksheets.pdf
    • https://static.usrfiles.com/ugd/7d21c0_e53fa5a556b84f0995ef482b7566bc2b.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_625a9f4493a8412f809cc13bb458cb16.pdf
    • https://static.usrfiles.com/ugd/c20ea7_207c67ed1f3a4254a6ee8e23e2bb2efd.pdf
    • https://static.usrfiles.com/ugd/89c6ad_713bbd3aa33b485789f4b0359016f66f.pdf
    • https://static.usrfiles.com/ugd/73c254_b3ab2d94f34a43d3be5c72afe84f2655.pdf
    • https://static.usrfiles.com/ugd/10e3af_7b5d3721e02f4f6a8f83bd89aad2b2c0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071ef.bin
bd45e644076eb0d841741976045444c6057ea22029ac5159c5faf17d3b3ac217		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71EF 4892 bytes
font_01_sfnt_off000082a6.bin
03da3776119d52c1abf4d030060d0a6ea49cad850309ae3630fd6f09919c355b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A6 10368 bytes
font_02_sfnt_off0000a5dd.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5DD 4324 bytes

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