Malicious PDF — malware analysis report

Static analysis result for SHA-256 8884b0237a779e54…

MALICIOUS

PDF

43.7 KB Created: 2020-08-29 15:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 578683cfa99c76d41ddf9d8dd548b5de SHA-1: d9a0eccf370231cc95f12061c28b382ccc5222f1 SHA-256: 8884b0237a779e54bc49edd53d9af473e28a8ce8fa7f2a36af52a9714f42d619
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to external PDF files hosted on static.usrfiles.com. One of these links, https://ttraff.ru/wix?keyword=ariel+cartoon+coloring+pages, is flagged as malicious. This suggests the document is part of a link farm or SEO manipulation scheme, potentially designed to redirect users to malicious sites or host further malicious content. No scripts were extracted, and the document body is heavily obfuscated.

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.ru/wix?keyword=ariel+cartoon+coloring+pages
    • https://static.usrfiles.com/ugd/10e3af_e73bde3790e54606983e40ddd666b1d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_38247e5847b243f88e3bcc3b10585cce.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6b4234fe5b40cf8267ac9d5b319ead.pdf
    • https://static.usrfiles.com/ugd/a91264_49fa59f9b6274c798120b781a2bcfe4c.pdf
    • https://static.usrfiles.com/ugd/9734e7_a0c2d03dd65d4af49c133179f13c8406.pdf
    • https://static.usrfiles.com/ugd/4bb894_fd88342c424d4338a807e1902c120f51.pdf
    • https://static.usrfiles.com/ugd/b8c837_5174e7def6a94be988f14b32e2cadd09.pdf
    • https://static.usrfiles.com/ugd/b8c837_a36ea42998094656aa0a9fa596767647.pdf
    • https://static.usrfiles.com/ugd/b8c837_59d454b30adc47edb1a065119f5ce234.pdf
    • https://static.usrfiles.com/ugd/b8c837_b21fcf4222c04380986aaa691d8e7a95.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f7f3190808d45b599d585a6502508f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_293e9a8adda444519479fe0f31be8d2a.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_off00006e7f.bin
a2d43c1d3671b2076a16278573f6ed4cfad790ec8bf82cf6290759cd32a5628c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7F 5088 bytes
font_01_sfnt_off00007fd6.bin
74d95b5052965b65515af83aa3eb6ff877d98a4413afbac308d391dfb7494f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD6 10072 bytes

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