Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb38fff0e3bdb5f…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 09:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02ce25ee822e32dc762a4c4347cdccc6 SHA-1: 5a488a7132ddce3b818940e6de1d8e4207a6201e SHA-256: aeb38fff0e3bdb5fbf45e9de01a5cd6a196af5acaaaa3f4e1161364eb0c9e4db
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=multimedia+educativa+redalyc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one to 'https://cdn.shopify.com/s/files/1/0457/6709/8534/files/pafepuvuwiwixerobivizol.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains these URLs, reinforcing the redirection attempt.

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=multimedia+educativa+redalyc
    • https://cdn.shopify.com/s/files/1/0457/6709/8534/files/pafepuvuwiwixerobivizol.pdf
    • https://cdn.shopify.com/s/files/1/0432/4150/4927/files/cambridge_advanced_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0430/5007/4269/files/29717693884.pdf
    • https://static.usrfiles.com/ugd/0b46e6_54f7b18148104679b1582d9da72646a9.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_1bfd45aea4414d828c36d270c0cf0878.pdf
    • https://static.usrfiles.com/ugd/837d34_0cfbb8326df5435a8163ad8112997aa9.pdf
    • https://static.usrfiles.com/ugd/b8c837_136a7fb3610b45b89b3d2de77bad39f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f6e0a5b89b14037a7c44b6d91043543.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7112932bd574c32bcf9b88ad9cab949.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a227b7e916a457b9ae8e2dbba4cf81c.pdf
    • https://static.usrfiles.com/ugd/b8c837_811a76de6e2a46d895548fab17035b52.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cef71c938cc471db271b92371283acb.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_off0000683b.bin
9694093eadb04214bc2b51c4059d9a70413251771299f64b3e78ec1ee2d34ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683B 5076 bytes
font_01_sfnt_off00007973.bin
c3badc174c9f1936f9c1071994c8d700b62f5b2b949d6ad47c635edc11de7799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7973 9812 bytes

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