Malicious PDF — malware analysis report

Static analysis result for SHA-256 204309a74025908e…

MALICIOUS

PDF

50.1 KB Created: 2020-09-02 07:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d0433b9d75e7538523febe4d8e5b3ec SHA-1: 4bf078e8538c1f379f3122072805f58a88da0a13 SHA-256: 204309a74025908e47d3e586799f10d530da52db47cb9e8b912d63582a8e76e7
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=nuclear+gauge+sign+out+sheet'. This URL is presented within the document body, disguised as a 'Nuclear gauge sign out sheet', to entice users to click it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to static.usrfiles.com. The primary malicious URL is the most critical IOC.

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=nuclear+gauge+sign+out+sheet
    • https://static.usrfiles.com/ugd/4c1554_46a582efdd2f4e73ad3613b02ef2fdde.pdf
    • https://static.usrfiles.com/ugd/b8c837_61aa954e9a2c416e8cf530f4bbf5c2ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fd6dde36e6c4f75972e0fb7528a641d.pdf
    • https://static.usrfiles.com/ugd/b8c837_077be8bd44074cc59e5e93c322d316e4.pdf
    • https://static.usrfiles.com/ugd/a01749_b72d39d9470646c09f8fc57d34b10828.pdf
    • https://static.usrfiles.com/ugd/93c935_dc40f154362e464db822bf97418f0803.pdf
    • https://cdn.shopify.com/s/files/1/0429/2748/9183/files/gogokusabu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2712/8735/files/aisi_316ti.pdf
    • https://cdn.shopify.com/s/files/1/0462/5042/6519/files/rukamaruzevanakasef.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/half_and_quarter_of_shapes_worksheet.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_off00008871.bin
2d1d4c7b0c5feb6a655e6440ed37684e5d02f55ea2c73fedd1c79daadaf8a70b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8871 5028 bytes
font_01_sfnt_off0000998b.bin
c8fd0a13ca7bb41cabfc3f826d461c93fe0257d16b82b81f773f3dc0363d7480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x998B 10032 bytes

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