Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4b483c45612e1a…

MALICIOUS

PDF

34.8 KB Created: 2020-08-20 01:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b23e005867589aefaeda89be146c5d6e SHA-1: 2d669a1dd3e00e9868d7cf7fc4a64882e97f5a5c SHA-256: bf4b483c45612e1aee67834a96e683de4186a539bb5a0f244541ab129b37feb3
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or distribute content through a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves leveraging these links for malicious redirection or content distribution.

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/pify?keyword=closer+ne+yo+sheet+music
    • http://dumexawu.wrapthatjuul.com/uploads/1/3/0/7/130776699/ridozewopixikuwetik.pdf
    • http://sikuj.whareafire.com/uploads/1/3/1/4/131437462/b2e764200c60.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/84907582021.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1068/files/bafelokuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/39948014066.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/pubeje.pdf
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/62110440995.pdf
    • https://cdn.shopify.com/s/files/1/0433/6192/7318/files/beviwagasupinujujopipegeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/68454573310.pdf
    • https://cdn.shopify.com/s/files/1/0435/7357/5841/files/41444226875.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/82578637237.pdf
    • https://cdn.shopify.com/s/files/1/0434/7795/8816/files/functions_of_vocational_guidance.pdf
    • https://cdn.shopify.com/s/files/1/0438/7173/1880/files/architectural_acoustics.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_off00004ae0.bin
a0b0c2208d0458ccb46b1f59bc3b9653127476aa48d91a197ee89c3c9abcf2a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE0 4836 bytes
font_01_sfnt_off00005b2b.bin
48d561ae9c9e0fc702cb934705aae394f16708105d716f59869d2b2845fded9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2B 10428 bytes

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