Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68c405cbeefdc4d…

MALICIOUS

PDF

41.5 KB Created: 2020-08-15 05:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6550e130bc44765b3458c915d14631d SHA-1: 0381fff0c42db872028870d836ea8fd5d1f84a93 SHA-256: b68c405cbeefdc4d31404f95c89af327205bc48bb51c7ff04a8c2b41ccc04bad
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and references a popular book title, suggesting a lure. The presence of a link farm heuristic further indicates an attempt to distribute malicious content or engage in SEO poisoning.

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.com/wb?keyword=neil%20gaiman%20coraline%20pdf
    • http://files.tedcoyle.net/uploads/1/3/2/3/132302951/8460d.pdf
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/gugax.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3708/files/mufokadetavisuwizorume.pdf
    • https://cdn.shopify.com/s/files/1/0439/5397/9550/files/bruce_lee_s_fighting_method.pdf
    • https://cdn.shopify.com/s/files/1/0439/2232/5672/files/makro_catalogue_march_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8180/files/16977616290.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3157/files/poxajofa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8219/5879/files/fopepituga.pdf
    • https://cdn.shopify.com/s/files/1/0439/3956/1630/files/36129399004.pdf
    • https://cdn.shopify.com/s/files/1/0431/1282/4993/files/15641719352.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_off000065f8.bin
5c376bccf073ab7fcd1b24f1ed47d83189f6633d13fc11394d00c9a8f64b80ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F8 5264 bytes
font_01_sfnt_off000077c3.bin
ff58627e525329a22eb83466162f4c981a63018ba6c9eef37f0542d75c2d4952		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 10084 bytes

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