Malicious PDF — malware analysis report

Static analysis result for SHA-256 831ce075cedae778…

MALICIOUS

PDF

46.1 KB Created: 2020-08-31 03:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 533581c7e0f946b519fd13616b446fb0 SHA-1: 198ad90c1c6f567de41e6552aea439a07b2c5c7c SHA-256: 831ce075cedae77854ed60c7be6bf649d11ebefdd7d17a6037a74dd014ffc0e2
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=uncertainty+of+volumetric+flask'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same redirect URL. The primary attack pattern involves luring the user to this malicious URL.

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=uncertainty+of+volumetric+flask
    • https://static.usrfiles.com/ugd/c3f88d_43bcec36d6904c789165ebdbdeaebb5a.pdf
    • https://static.usrfiles.com/ugd/409ca8_483722f218ce4901aac5890031f440b8.pdf
    • https://static.usrfiles.com/ugd/12f4eb_6e6729a085304376bd61391d9cdf7f06.pdf
    • https://static.usrfiles.com/ugd/33a2e4_c27a9ac48fea4641854af59f7df5496b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5941800d48d84f419c6aca8870b62f18.pdf
    • https://static.usrfiles.com/ugd/12dc78_7cec4618ed0f451390bae2db25409253.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fb55a0add6e4304b3a96b56f0bdc8e2.pdf
    • https://static.usrfiles.com/ugd/6116da_ce2dae81cebd4c44909844b1afddaabc.pdf
    • https://static.usrfiles.com/ugd/913720_b73312353d274a178737773619b106ed.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_9b1e183142004e89b8e3138fdecb1742.pdf
    • https://static.usrfiles.com/ugd/b8c837_4842eed6d5a84d8d92bc37c9d1969aaa.pdf
    • https://static.usrfiles.com/ugd/58a813_0080b1927e524289a0c371a893407e32.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a4153a7e19d47fa837278ad535180e7.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_off000076cf.bin
f248e43676311382f1d0c0af82e8fe918d1c052c9b67f0b1c1eca9a4c17db24d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CF 5244 bytes
font_01_sfnt_off0000889d.bin
ccd2e5ed0e18f7b4fa8e0d47e6162042894ce6d98f38e62c8b82ebece6b80b48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x889D 10184 bytes

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