Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9b3d6a43dfc596…

MALICIOUS

PDF

51.5 KB Created: 2020-08-29 07:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81d3c28abc91b473196fcb2f94469744 SHA-1: 4acabe579adf9fe3abc20b40bff9dd3330de3c7c SHA-256: 4c9b3d6a43dfc596463e8ec53bd21cdada6df8ea2f0c0ade8570480d6e699fcc
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with 'static.usrfiles.com' being a dominant host. The document body, though heavily obfuscated, contains the malicious URL. This suggests the primary attack vector is luring the user to a malicious site via the embedded link.

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=modelos+de+salud+enfermedad
    • https://static.usrfiles.com/ugd/b8c837_df1e1e1c7dc249658be1a42a5f020220.pdf
    • https://static.usrfiles.com/ugd/b8c837_117d75b6444e4070a4938bab2526fbed.pdf
    • https://static.usrfiles.com/ugd/b8c837_f24b2a8162de48dea51353511b9fd9f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f5df364077b4c2c9bb7c1e71aeafdba.pdf
    • https://static.usrfiles.com/ugd/b8c837_84db9e038b76482c880203a6b52351f6.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/89418131157.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5045/files/32728693407.pdf
    • https://static.usrfiles.com/ugd/b8c837_495b255cf0bb4d7cac6070c91c4eddff.pdf
    • https://static.usrfiles.com/ugd/b8c837_808ed6bc52454164bcfb3ea2763fa2b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_64b608b7bbc74c3aabf78f18ce281792.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ef4a914d18b43e38ab06a1d212f65a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_32d0e5eec7444aec95b8c0c306ace257.pdf
    • https://static.usrfiles.com/ugd/b8c837_83b5581846904130aa0d4c35885f5f10.pdf
    • https://static.usrfiles.com/ugd/b8c837_441e3a808b99455dab9bd83af84f3a4f.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_off00008b9c.bin
403263fd4db5469194cfa398627e40a2328b8f363e3a46e6b735a7c2e7702a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9C 5056 bytes
font_01_sfnt_off00009cbe.bin
8f04c27fb85976190239bccbb52b28a044678838ac4a21d5faad23eeab7cd64e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBE 10612 bytes

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