Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30c5691af7f7a9a…

MALICIOUS

PDF

51.6 KB Created: 2020-08-31 00:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d1e8e50fb4cce2f11cbb348909ca6c7 SHA-1: 46a4e18b8c379937a8efdea90a9db517c572b558 SHA-256: a30c5691af7f7a9af5595cfcb27a03753bfaba271dba534c0a29d99bd417e43b
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=modern+tkinter+for+busy+python+devel'. This URL is presented within the document body, disguised as a resource for Python development. The presence of a large number of external PDF links, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning tactic to distribute the malicious URL. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=modern+tkinter+for+busy+python+devel
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/16438970855.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/kukusilawazefoxeronajeke.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8733/files/compressor_settings_for_speech.pdf
    • https://static.usrfiles.com/ugd/6290de_481efa921acb4857a84ff85f622ba465.pdf
    • https://static.usrfiles.com/ugd/b8c837_424092784b1441f19ed5e9047d8dc79f.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_842279d9013240e98d2647b815e4acbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_d78f471f79da4167b0a7e9953e87252a.pdf
    • https://static.usrfiles.com/ugd/b8c837_352760b18915450b8498e5fa2d09abc4.pdf
    • https://static.usrfiles.com/ugd/34e21e_b7a330eeae4948a7abfb4b5a7eccbbc0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b14eb682f704021adc5dfbf9910e8c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d60ebab9554d4247b20a0034793baf23.pdf
    • https://static.usrfiles.com/ugd/f459ea_77a2e60ace2543178ca928c9a28ef2d5.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_off00008bac.bin
22b3becfe7480f50680c43b3ce54d1a2337b695e4bcc8fe17da513394b4674cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAC 5288 bytes
font_01_sfnt_off00009db5.bin
5571fcdbab7c842b50e5c1b6fab864cd36a2ce946beaf3655a084e471d52c08f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB5 10604 bytes

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