Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e640f9b764e8ad…

MALICIOUS

PDF

40.8 KB Created: 2020-08-29 22:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf444579d1fd7293e46353a043d45357 SHA-1: 838ad9f41d59a727bc5989786edd21de46ec2897 SHA-256: 24e640f9b764e8ad154bbe690198d96fdcfbfc569ff2f9eded13887d45765018
150 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, a common technique for SEO poisoning and redirecting users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL pointing to ttraff.ru, which is known malicious infrastructure. The ML classifier also strongly indicates maliciousness. The document body itself is largely unreadable, but the presence of the malicious URL and the link farm structure strongly suggest a phishing or redirection attack.

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=distal+radioulnar+joint+movement
    • https://cdn.shopify.com/s/files/1/0433/1667/4713/files/97830543801.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/spasticity_pathophysiology_evaluation_and_management.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/52798431548.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/susudebasejidoli.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/romones.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb535a3769be4c5fbdc1600a9f909bca.pdf
    • https://static.usrfiles.com/ugd/0a0016_8bb90381710449608ede3df95e7ec9e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f4278d71d22471597b283dbeea6eddd.pdf
    • https://static.usrfiles.com/ugd/b8c837_9861b9e5a22748e091115c8e140b1ca8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c75db886b81846b0883d07e6a5c0cedd.pdf
    • https://static.usrfiles.com/ugd/5de1df_91371358077c4d89996374818bd47557.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_b08bab2bf4084bb6b87cc48b4dd48bfc.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_off000061b8.bin
9be498f2019cdd44a894c1c9b07c6cfd6a86bb9d7c7376731b09fdd855026296		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B8 5108 bytes
font_01_sfnt_off000072fe.bin
f87c4e1482076bbcaaed3c3716c2245c598e8bae3903a15daf01552b08585da5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FE 10536 bytes

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