Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a2bf39efef0137…

MALICIOUS

PDF

41.1 KB Created: 2020-08-28 19:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf086fdba7f0f4b704b81d84034821af SHA-1: 5a8592beb7e0e8b2affd7852323b81cb419cd97f SHA-256: 38a2bf39efef0137eb3c0a2ab0f7f82d356ca48b28ba5de446e198acbd609134
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Personal taste torrent' and the malicious URL, suggesting a lure for users seeking torrents. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly indicate this PDF is designed to lead users to malicious content. No scripts were extracted from this sample.

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.cc/wix?keyword=personal+taste+torrent
    • https://static.usrfiles.com/ugd/b8c837_25449e10606b4d90bb17b4753bd07f7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_66982b67d4c2464abc877d2469cd7e2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a29c14bffb44ce28fe3157b1f5f3a50.pdf
    • https://cdn.shopify.com/s/files/1/0435/1927/9264/files/cbse_date_sheet_2020_class_10_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/38353312945.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/ludotawawakasuxugakilab.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2093/files/ditisolefowebulujumu.pdf
    • https://static.usrfiles.com/ugd/b8c837_0252aac7b25f41178d4ae09497bf6393.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf9afa210ccd4576ace0f8eb31f8251d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad796a46abf149ef8058e49501923ca8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4506f7c46214facacc6fc0c8b826402.pdf
    • https://static.usrfiles.com/ugd/b8c837_89144cee0e56416bb73b154dfc3b7f77.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cd3d2001f3f4b24a3b17dcfecd18bb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_115051585d174e71acad2c1513252438.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_off00005797.bin
9755042c56c73682c2dd7ff31f2865568a290f62160da800ea2969aeffda77e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5797 4680 bytes
font_01_sfnt_off00006784.bin
6f8e9ba063d78935862c14d582e3154fe109d2980360a2038ceb9c5e3cdf72b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6784 15236 bytes

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