Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23ac80f54a25625…

MALICIOUS

PDF

43.6 KB Created: 2020-08-31 00:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 865faf2263a0a23ae51fc3265315250c SHA-1: e83982cf90fd96743684587da0971eb5a49d2186 SHA-256: d23ac80f54a256256ec96c125bbf6af1589a435f65df9632908571a769753180
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of the primary links, however, directs to 'ttraff.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the title 'Como se curten los sartenes de hierr' and the malicious URL, suggesting a lure to a potentially harmful site.

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=como+se+curten+los+sartenes+de+hierr
    • https://static.usrfiles.com/ugd/b8c837_d6e2d46d0e454a4c8ba63f7b806c40a2.pdf
    • https://static.usrfiles.com/ugd/d78803_9d4b180fdffd4e46982f593e9a3b46b1.pdf
    • https://static.usrfiles.com/ugd/760101_2ceaa6a413044aae97d4ba2db15bcaea.pdf
    • https://static.usrfiles.com/ugd/739437_9760a24525594bae98b402c50a2413a9.pdf
    • https://static.usrfiles.com/ugd/80c1db_30165df2bf454ae8b938627a0249596c.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_45e424bf1bb14ebdad2476fdf3b3ea84.pdf
    • https://static.usrfiles.com/ugd/a382ee_0431219434314b9c9a83d4e4f36401c6.pdf
    • https://static.usrfiles.com/ugd/77d535_e3f2893f56224f5ab03c0e4053b2c57c.pdf
    • https://static.usrfiles.com/ugd/913720_65d74c79c4b84716b4ab358b551e8f6e.pdf
    • https://static.usrfiles.com/ugd/934fc3_9deaf9c4306b44fea0fc71ba36a0d9dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_ca40a1fc49a2463e946423faa3ff8284.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_off00006cf6.bin
3dcdaad035bd43ba81773131dfe292ba730c5b33a4b172851305e50125b8c767		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF6 5084 bytes
font_01_sfnt_off00007e04.bin
7454505717ec620521b67e07da29c232a13203de9d27a9d32b0ee70ed758614c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E04 11124 bytes

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