Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c65c744773354b7…

MALICIOUS

PDF

37.6 KB Created: 2020-08-30 07:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bda8fa5a519d7f919564cf528fd646ab SHA-1: 4c303b0044df966d44532ca50919e400c1f9800f SHA-256: 4c65c744773354b7c95b1c4109d5565e22fa044f32117bb8787a533a3135fee7
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is presented as guitar tabs. This indicates a social engineering lure to trick the user into visiting a potentially harmful site. The PDF also hosts a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to improve search engine ranking for malicious content. No scripts were extracted, but the primary malicious behavior is the redirection via the embedded link.

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.me/wix?keyword=leather+and+lace+guitar+tabs
    • https://static.usrfiles.com/ugd/b8c837_dd5307d50f8c420bb8eef6f98dc113ef.pdf
    • https://static.usrfiles.com/ugd/271e65_03e7ae1b213a4e4eada93e4f17dda781.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e879196731f4fcd8f61cb0a8b758c74.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2a7f909c2aa42d596bc83264ff99d4c.pdf
    • https://static.usrfiles.com/ugd/f46427_7e4b422ae3be41bd837d30870e06713d.pdf
    • https://static.usrfiles.com/ugd/cdb50c_ea89cfc10df04e30bb083627af3b7eb6.pdf
    • https://static.usrfiles.com/ugd/79cb75_3fdf62313cb9423c80216d530893fd0e.pdf
    • https://static.usrfiles.com/ugd/225520_e895cde68beb454aa1d1adfcfc7595af.pdf
    • https://static.usrfiles.com/ugd/b8c837_e35fb9174f764b579e129f622a8f2444.pdf
    • https://static.usrfiles.com/ugd/06497e_e1af98e88558433db77affceadd0e665.pdf
    • https://static.usrfiles.com/ugd/b8c837_0456f83b53964426a41325bac41d8f95.pdf
    • https://static.usrfiles.com/ugd/b8c837_20120a4b11384d389bb93c1fe5809df7.pdf
    • https://static.usrfiles.com/ugd/d43733_6d7b1f75cc2440e0946aa2c390eb1733.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bc0987d876a49da86f1f0a1c43d0539.pdf
    • https://static.usrfiles.com/ugd/d162e3_b60a695f6c5a4e669ab43518d1033331.pdf
    • https://static.usrfiles.com/ugd/affaa6_b8fa76c30dfa414d9fb2dffd08b5376d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000493c.bin
b6db3a68a8dd1d1f4dd241d0dece4c6758fcf19f3709abc573ce839afb6ad088
pdf-font-stream PDF embedded font (sfnt) at offset 0x493C 5052 bytes
font_01_sfnt_off00005a54.bin
9bd2ad6853216980298266a6f948cef4b55762bdd3dc765a01b9a9a778d6870b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A54 9644 bytes
font_02_sfnt_off00007b62.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B62 4324 bytes