Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b33dcbebd93315…

MALICIOUS

PDF

51.4 KB Created: 2020-09-08 17:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1a2b7b60e5b124c46fc8e07215df339 SHA-1: 8525bcad98681f900a3b957785ac6298383e5c0b SHA-256: 28b33dcbebd933153773452111d2202e1fb5849c1187a5f76ac5b3d2456021f6
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL 'https://ttraff.club/wix?keyword=daily+chore+chart+template+free' is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.club/wix?keyword=daily+chore+chart+template+free
    • https://static.usrfiles.com/ugd/469aea_772f36566e2f4fe1aa31fc321bbbb18d.pdf
    • https://static.usrfiles.com/ugd/eaf48f_551ef9383dd44948a1296d96f8352bed.pdf
    • https://static.usrfiles.com/ugd/b8c837_eaf3340ce393431a8cf9bcce220e30dd.pdf
    • https://static.usrfiles.com/ugd/e23fbb_04089d60127842b49968a3bd7aa3f77c.pdf
    • https://static.usrfiles.com/ugd/754d94_142a97607eec46bba74857c3cb6da959.pdf
    • https://static.usrfiles.com/ugd/4cd51e_d711ac545a774fc29a9dc5bdd08f96b2.pdf
    • https://static.usrfiles.com/ugd/0a84ca_ac2626c739da4e019c35004561411eb4.pdf
    • https://static.usrfiles.com/ugd/83b1b3_7c8c028b17cd4808ab334a9fe9c3062b.pdf
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/95381633384.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/56905702218.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0357/files/jegiguzofigiwuzux.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5819/files/88569334549.pdf
    • https://static.usrfiles.com/ugd/ea2c45_390022dc36fc4e54b2e36cdeb7a47380.pdf
    • https://static.usrfiles.com/ugd/7c3584_86694ea547294f7eb8d3d3c820229259.pdf
    • https://static.usrfiles.com/ugd/e56fe2_0511801f05954317ac6ee3331e35f728.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_off00008c90.bin
0d15e2e5e5028f08b8c5b790cb8bc6b0ac54098dbc3b144925566c4706b1a647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C90 5176 bytes
font_01_sfnt_off00009e12.bin
187d48198315b256a8dd5067b81816cb48ff3bbf204d7c61772213ab5bcb3ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E12 10024 bytes

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