Malicious PDF — malware analysis report

Static analysis result for SHA-256 8463f24655ecda8a…

MALICIOUS

PDF

43.2 KB Created: 2020-08-30 15:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04af6d7f13bd82bf49021f48d1b9193d SHA-1: 0cfa01559c42279014d746fbc327d547c30d9065 SHA-256: 8463f24655ecda8a367023c67ac060114d1e8f1cdeaf279c7ab2b40fb2ba0fc2
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, https://ttraff.com/wix?keyword=a+hunger+artist+pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and references to the malicious URL, suggesting an attempt to disguise the malicious intent.

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/wix?keyword=a+hunger+artist+pdf
    • https://static.usrfiles.com/ugd/b8c837_9a487ad2d96e4df2949d3a1a9a78f803.pdf
    • https://static.usrfiles.com/ugd/b8c837_9de4dfa3c6964f938a672be2f94dec18.pdf
    • https://static.usrfiles.com/ugd/4b874d_bf0eb2b4a9b04a9d9cc49a11e0b13007.pdf
    • https://static.usrfiles.com/ugd/b8c837_626a42b00ac241278c55a1596d4feacd.pdf
    • https://static.usrfiles.com/ugd/b8c837_809096bc45d647aabe6144a7a1001dca.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/88668994107.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4163/files/jikejenonuriberokoka.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/meter_data_acquisition_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/pisikaxoluwawuz.pdf
    • https://static.usrfiles.com/ugd/493135_f6267efee190482b809f733d34428a21.pdf
    • https://static.usrfiles.com/ugd/66c878_bcc6267926a74756b6209e0fc88e71b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9041e3a4ecf47f2bb1f5f26774a73c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5c39ae288aa48338b4977a89dcd2e02.pdf
    • https://static.usrfiles.com/ugd/b8c837_3705223500e5488a8416facf6a26b62b.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_off00006b61.bin
2979e94435e708e89c08e4ad505385a9057b46ae038eac49d41ed44fc5975801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B61 5260 bytes
font_01_sfnt_off00007d38.bin
8ac7871c37378d319197d11e30240de50a4e3ac2a52bf32bc22c52757514def2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D38 10056 bytes

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