Malicious PDF — malware analysis report

Static analysis result for SHA-256 561449aed7117e21…

MALICIOUS

PDF

40.7 KB Created: 2020-09-01 15:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 595a1d15ca88cf039ac65ad37b015647 SHA-1: bf22405132a469f2342cfc79d360fe65a05f9d02 SHA-256: 561449aed7117e21dc17ec020fa179ebd4f46b5b3a82f6481f032d17a27c2347
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=contracted+forms+worksheets'. This URL is presented within the document body, disguised as a link to 'contracted forms worksheets'. The PDF also contains a large number of external links, many of which point to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to distribute the malicious redirector.

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.link/wix?keyword=contracted+forms+worksheets
    • https://static.u
    • https://static.usrfiles.com/ugd/451461_d32eefe302aa48c38602af3a48632c9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9f5a119ddc6454ab9c408a446377ea1.pdf
    • https://static.usrfiles.com/ugd/07625c_6be1ac57e6ee4d6aaa36e02eb26fe87d.pdf
    • https://static.usrfiles.com/ugd/de02f3_05d04c1f8db147e28f8fcdfbddcf24d3.pdf
    • https://static.usrfiles.com/ugd/d9e9a0_d7f5bc57b71b426b9d66e7959687e51c.pdf
    • https://static.usrfiles.com/ugd/d55797_c53831f67de840ce8c37a1b59b9ffd78.pdf
    • https://static.usrfiles.com/ugd/0c4177_2a080fb775b7495e9dee4b65e1801d10.pdf
    • https://static.usrfiles.com/ugd/ecec20_eb44ae8c20c84b89ba47ce7ff88fbfa6.pdf
    • https://static.usrfiles.com/ugd/96bf9d_9a8bf37dd3014315b1bc71f47dc9018b.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_0da85b8e94f642839c60f8a5221a4663.pdf
    • https://static.usrfiles.com/ugd/80c1db_fd7d8ceaf08243309d63119b72b7de93.pdf
    • https://static.usrfiles.com/ugd/19ce5d_0bd540b5b7744ae4969931732cfa91a5.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_off000060a6.bin
cd837e6bb1d181be839d9f3e8bf3a240bfb13e71676e36066e3f50b94216a25e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A6 5288 bytes
font_01_sfnt_off0000728b.bin
b7e69c60a1fbe67845dee0af3a687b033feb950b024b3c9a93ebf194075255ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728B 10428 bytes

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