Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9db2a8f2f087a4…

MALICIOUS

PDF

43.5 KB Created: 2020-09-01 19:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b06c228c8bf2dc33cceeb46e4b99ec73 SHA-1: 5510e1030f34165cf5a81403abcb396e232fb1a9 SHA-256: 4a9db2a8f2f087a4f7793202da0c712fe67a673d9446450e44ba04a8c01d94e7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=ashampoo+pdf+free+test', is designed to lure users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, suggesting a broader distribution or SEO manipulation tactic. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=ashampoo+pdf+free+test
    • https://static.usrfiles.com/ugd/b8c837_c5576bb4e82e473a9abac39e90c939a7.pdf
    • https://static.usrfiles.com/ugd/02beb7_45014cbcff6b46578f68b75dfc361f89.pdf
    • https://static.usrfiles.com/ugd/2f8cea_71e06952b4234ae3ba50f60741eb6b3e.pdf
    • https://static.usrfiles.com/ugd/d1d005_8511ddd95ebe49c0a202644413b59128.pdf
    • https://static.usrfiles.com/ugd/824332_3737ba95647c4146890214c55d6245ad.pdf
    • https://static.usrfiles.com/ugd/87fdc7_cb68b0e6901f469ea04ff2d4b13e3d30.pdf
    • https://static.usrfiles.com/ugd/aec2ea_3b1f87646c2d4f5ea6694873d6ed9238.pdf
    • https://static.usrfiles.com/ugd/b85eb0_fd178af268dc419aa072c0284a3f9fb8.pdf
    • https://static.usrfiles.com/ugd/52b593_12dc7fae680f4cf3864d4bcce9d08264.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2823/files/gta_online_guide_biker.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7505/files/48219924768.pdf
    • https://cdn.shopify.com/s/files/1/0435/5129/3603/files/pawarozibufemisaro.pdf
    • https://static.usrfiles.com/ugd/191a6d_0c56f81465714f2fb4da63e5c490e189.pdf
    • https://static.usrfiles.com/ugd/bfbc46_f3cd56b3cc6a41fc9e866b762757cc54.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_off00006416.bin
89dd58af4c666bf68a8dfdc0556af20c0ff0a2463061580796afb6b07c923b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6416 5240 bytes
font_01_sfnt_off000075c0.bin
3bfe24dd752a43d9e3b1f0222a8f96293a14306f4ab8d8d12960a4e601b1c045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75C0 13420 bytes

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