Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5db3d1ee41739d9…

MALICIOUS

PDF

33.1 KB Created: 2020-09-04 07:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac83beaaeacb19d2f07a75b07140dbf1 SHA-1: 7a67ba7c794759e860f3984bc8b31069db95b0a8 SHA-256: f5db3d1ee41739d9b88e8fa772c56b0a38ffe12bee87be97db35018d33973e95
150 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to "Ugandan music videos" and the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive document, leading to a redirector.

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.club/wix?keyword=ugandan+music+videos
    • https://static.usrfiles.com/ugd/b8c837_43597533810547daa7ba4c2ad732d0a5.pdf
    • https://static.usrfiles.com/ugd/0aab01_4f4f57511ebc464aa7644b79801791ac.pdf
    • https://static.usrfiles.com/ugd/db93e9_44f7ea058fd344b1858f216d29bf0081.pdf
    • https://cdn.shopify.com/s/files/1/0433/8938/6901/files/16531309564.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/thinking_with_type_2nd_edition.pdf
    • https://static.usrfiles.com/ugd/db1da1_80bf530447d640ca8c2cce755e3e1f9e.pdf
    • https://static.usrfiles.com/ugd/db1da1_1ae375772d4140f385e3221e6f254bc9.pdf
    • https://static.usrfiles.com/ugd/4b7290_9b0cdfe284414cabaafed77adcd553d8.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/24993211159.pdf
    • https://cdn.shopify.com/s/files/1/0436/2554/5890/files/yamaha_dt_250_service_manual.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_off00003b7a.bin
22410de48a95cbc9da6701cb5cf4f4f974097c0a769b475d4be7878324bdbd71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3B7A 5180 bytes
font_01_sfnt_off00004d17.bin
007045b0f4fa9fd61de4c73d634ff87e64deacc3c9da15fe324cc5a4255c656d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D17 13324 bytes

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