Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3da4bb665368265…

MALICIOUS

PDF

50.0 KB Created: 2020-09-06 12:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 447f5b801f6c65bce03999feb2532de5 SHA-1: 3d406df3a8e7d2b2aad6a4ce2a0bd7ec329356fb SHA-256: f3da4bb6653682651788506bb3da0b34db5c9b5527cc714b5506f57ddc6ba228
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/pify?keyword=cursive+writing+learning+sheets'. This URL is presented within the document body, disguised as 'Cursive writing learning sheets', to entice users to click it. The PDF also contains a mass external PDF link farm, with 28 links hosted on 'static.usrfiles.com', though most of these appear benign. The primary malicious intent appears to be redirecting users to the ttraff.me domain.

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/pify?keyword=cursive+writing+learning+sheets
    • https://static.usrfiles.com/ugd/badafb_fc95ee6ad454412690d32f53c1eee8ab.pdf
    • https://static.usrfiles.com/ugd/c5d40f_ed5c129eb6d14c78873ad98bd2912564.pdf
    • https://static.usrfiles.com/ugd/756799_14849a98db0445d689a76e5d77c456d5.pdf
    • https://static.usrfiles.com/ugd/4d548e_c588010057c545e3aa786720b85d7cf0.pdf
    • https://static.usrfiles.com/ugd/f0e51d_c8c4d73f9e7746da97b1c7fd14d681ef.pdf
    • https://static.usrfiles.com/ugd/33ab24_693891d04d974571ae2914c1ba5fe7b5.pdf
    • https://static.usrfiles.com/ugd/902d29_74b96eb5e6994dee92cadda2124b8ead.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1982beb60f4633a0fc9de9b3d86fd8.pdf
    • https://static.usrfiles.com/ugd/7f614e_65ca6d824f58461d9e54354a96b995c3.pdf
    • https://static.usrfiles.com/ugd/f2c1dc_4bbaead23766414aa16367d051526f0d.pdf
    • https://static.usrfiles.com/ugd/31593d_29aa154859db42e691dd586e71997a3c.pdf
    • https://static.usrfiles.com/ugd/510691_3132d699477e4e30acbda18d96a0a0f9.pdf
    • https://static.usrfiles.com/ugd/b88e3d_ce515b0ea70f4cfba05a52d25fd1a35e.pdf
    • https://static.usrfiles.com/ugd/24853a_79fa95a8877144a393bf24e34029daa2.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_off000075f3.bin
1944fcac93ed9526c297b68f27f69c9988bcfca212b830569211b4190614f639		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F3 3292 bytes
font_01_sfnt_off000081c4.bin
819319abf33e473e0721af8c4a758f0692711e761c35974338f0f4648ffc503c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C4 5004 bytes
font_02_sfnt_off000092d3.bin
95ad2e9344964a459a958fb3a238519c575c5add0580cd18bc2f8b249ff173f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D3 11616 bytes

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