Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff951f32224d8b6c…

MALICIOUS

PDF

40.8 KB Created: 2020-08-29 23:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5575e30e64c37f099b46780e22c87b15 SHA-1: 94722f7d001ad5a071b1cdfd6185b5011cd15c2b SHA-256: ff951f32224d8b6ce8021199fb876fdadf8a16827690702cac77a2c3e3ad8763
120 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a spatial aptitude test. The document body, though corrupted, contains text related to this lure. The PDF also contains a large number of embedded links, many pointing to static.usrfiles.com, which is flagged as a link farm. The primary malicious IOC is the redirector 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=spatial+aptitude+test+questions+and+answers+pdf
    • https://static.usrfiles.com/ugd/c1108c_f93c5be4618a4b9f8b659fc5978d46f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_844f99191be048459ebf93f46e03fc78.pdf
    • https://static.usrfiles.com/ugd/b8c837_b975b632d8944172bf2e7ea2626eab0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_173c99e94a0640a4accc19156c7143b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_dac046756b5645e0902e25a83b11bb75.pdf
    • https://static.usrfiles.com/ugd/12dc78_5324f7285aa4469c930e515843a8074b.pdf
    • https://static.usrfiles.com/ugd/b8c837_261a38a48e144ad491ef842401effe54.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcfb9e3be3f649bc813496de8b74e824.pdf
    • https://static.usrfiles.com/ugd/b8c837_47248dd6f0a14672b265e6081293c3cb.pdf
    • https://static.usrfiles.com/ugd/2c8d66_1cd4e7a21b704f878cf6dc3fb01bcd72.pdf
    • https://static.usrfiles.com/ugd/b8c837_042c7a517b0643419b96d90e413b3267.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc3e5999a7de4cafb3d8ed7e44dd68bf.pdf
    • https://static.usrfiles.com/ugd/9757e7_32b13953051047ef8a777cd72ee0ad50.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_off00005fda.bin
c1fcee03be9f211061cc1470cc76548d7201cc15a5e5f09dae7e113693b0ae3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 5356 bytes
font_01_sfnt_off00007221.bin
adfb2cee1a9a4a095c168e253f8d0694a95e88d6736c5be7e7a3ca1c5442a052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7221 10860 bytes

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