Malicious PDF — malware analysis report

Static analysis result for SHA-256 3551c2616ec1cfb0…

MALICIOUS

PDF

35.7 KB Created: 2020-08-31 12:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ec90c56f5640adbc4a823f6a1e3620a SHA-1: 72dd5de8389904d04be207787b44ef7b98207754 SHA-256: 3551c2616ec1cfb025628433607cfdb1ae9686c0e8557344737cf6c9e9bc235b
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 the same domain, indicating a link farm. One of these links, https://ttraff.cc/wix?keyword=marea+verde+lengua+2o+eso, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on static.usrfiles.com, suggesting a coordinated effort to drive traffic to malicious infrastructure.

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.cc/wix?keyword=marea+verde+lengua+2o+eso
    • https://static.usrfiles.com/ugd/217d68_0e7a145b26054ee2a9372ec287e93508.pdf
    • https://static.usrfiles.com/ugd/b8c837_279ef81744504a499650d983e3ec846b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3b7170ea93f486198b35239bbecb89d.pdf
    • https://static.usrfiles.com/ugd/a382ee_3b9f3a43d0f9489186d4bf29a68498a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5fec7998f894ceabaf8546830461235.pdf
    • https://static.usrfiles.com/ugd/10e3af_318fea4ec02e4a21a7368a60d3fc21d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb72544a6fca4dfd9e1464d0e953b84e.pdf
    • https://static.usrfiles.com/ugd/4117a9_f7faa7a4b3794a14b3ff841327eadb94.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ca6542135bd4338936826dc674c0e5c.pdf
    • https://static.usrfiles.com/ugd/e3325f_6e3ce3f4168e4ce49628cb3e5a448670.pdf
    • https://static.usrfiles.com/ugd/8b97dd_993b634470c14facbbb9e8366482f930.pdf
    • https://static.usrfiles.com/ugd/8ab72e_42e29b3b7268461b9efb3f8bfe1a761b.pdf
    • https://static.usrfiles.com/ugd/544c7e_ff6c4222f7774112858c2669c4d878ff.pdf
    • https://static.usrfiles.com/ugd/2ca09c_92f64959fa414a969d4769ed1a9d7eb9.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_off00004c15.bin
f8d79e240c6aefb1189ccce0dfb2177d4ad0a3250df1bd9d8b5db275516ea07d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C15 5192 bytes
font_01_sfnt_off00005de3.bin
1c3575cc497f386b555197d34aaab44f921d2c1a575f4ce12c5a19b6020e0c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE3 10764 bytes

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