Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dbb1d161bb3cab…

MALICIOUS

PDF

32.4 KB Created: 2020-09-01 21:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c17b3fda07a6afd64c5f8822e26d11b8 SHA-1: 50b407926c3b9b48330187eb9adf69ca7f4a49f2 SHA-256: 23dbb1d161bb3cab5d34dce810b6c5bc1607f7f4e76dbcb3b15a0e08e8c9d178
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is presented in a context suggesting it leads to movie content. This heuristic, combined with the ML classifier's high confidence, indicates a phishing or redirection attempt. The document body, though heavily obfuscated, contains the malicious URL and other URLs that appear to be part of a link farm, likely for SEO manipulation to increase visibility of the malicious link.

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=bengali+best+comedy+movie
    • https://static.usrfiles.com/ugd/64d889_3939e1e1710c4d58836ce7a24598b896.pdf
    • https://static.usrfiles.com/ugd/599f1c_96cc65e744da45cc81c4a112c704a2f4.pdf
    • https://static.usrfiles.com/ugd/7f929b_a144ecaac790465aabb3f0d96c92d232.pdf
    • https://static.usrfiles.com/ugd/1813b3_a74a0ced2df141e788044b6e9e872be9.pdf
    • https://static.usrfiles.com/ugd/2f07a1_6c14d9a2ee9a4d6f9fbb23635c229e1c.pdf
    • https://cdn.shopify.com/s/files/1/0460/9405/7636/files/61752482674.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/madukeraxitipun.pdf
    • https://cdn.shopify.com/s/files/1/0429/2100/1119/files/rumutiwiluxeperajixupixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2977/files/4284466449.pdf
    • https://cdn.shopify.com/s/files/1/0434/8120/2854/files/83331955045.pdf
    • https://static.usrfiles.com/ugd/1e4819_4b766e035eed4165b40e972a3e51c5bb.pdf
    • https://static.usrfiles.com/ugd/35e1ce_6e350c8ec5644a96a4e0b7b7ae489287.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_off00004251.bin
bc8971e7ffa22bcf40e8987cc06f9bdb1e5df4008fdadf961e0c14797a2a3533		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4251 5516 bytes
font_01_sfnt_off00005509.bin
7d969ca127a827ab333a3f2299175a3e9dc295d63687e40979a9592bc413749f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5509 9436 bytes

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