Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c35bd2fcc00b63…

MALICIOUS

PDF

41.1 KB Created: 2020-09-05 08:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa07217e829dace9e3927f15deb83727 SHA-1: 94e35a1f25d25557b474ffb37e95bb6cdab8c129 SHA-256: f4c35bd2fcc00b63059523d8984907edc3a7f6fd2be8f2ad40701db2844cb8e4
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an employment contract template. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic shows a large number of external links, likely for SEO poisoning or to obscure the malicious redirector. The primary malicious IOC is the redirector URL.

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.me/wix?keyword=employment+contract+template+pakistan
    • https://cdn.shopify.com/s/files/1/0431/2976/6039/files/10174516777.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9380/files/71693951132.pdf
    • https://cdn.shopify.com/s/files/1/0463/0914/6784/files/creation_site_internet.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_06893a3f22a1475a9c41536ad48bafae.pdf
    • https://static.usrfiles.com/ugd/03a576_7e360799f4944cea8d4327cc19dbae75.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f53ec0b69594ddd80c7ee7099861fe4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fb875fa3d1c47099af43c8358cca095.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7543/files/dofirosijekamibitanak.pdf
    • https://cdn.shopify.com/s/files/1/0431/8045/8144/files/dead_space_3_pc_game.pdf
    • https://static.usrfiles.com/ugd/3649d2_2e222c9315e244af80152fbc09d77bd7.pdf
    • https://static.usrfiles.com/ugd/2eedf1_821f02a6fc534de59874a03fde85d9c6.pdf
    • https://static.usrfiles.com/ugd/0c4177_42e1beb134bf46549b1a5b4bf41cf620.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_off0000638d.bin
d728f3cada5f02ffe7e3c6e82555cc7b2c669fe3d80ef74d386e2e22a33b8904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638D 5200 bytes
font_01_sfnt_off00007532.bin
d3224b5230dabfeaf14c470ef7f34a9ba437438805cd07091d3a42a1e0bb05cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7532 10104 bytes

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