Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ecba352cfcd7bb…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 19:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83839f2210519823e57091a5455ecd15 SHA-1: 2a49102d07447eab0500d2794782da937f0b259a SHA-256: b1ecba352cfcd7bb61f54183a3f34fdb2b8e6e081a1eb9e83b3936f0c6800468
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic specifically flagged a link to a known malicious redirector. While the document body is heavily obfuscated, the presence of the malicious redirector URL and the link farm heuristic strongly suggest an intent to lure users to harmful content.

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/wix?keyword=mensaje+para+mujeres+embarazadas%2529
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/84833282780.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/kavaguwepal.pdf
    • https://cdn.shopify.com/s/files/1/0431/3903/9388/files/biwizesoki.pdf
    • https://static.usrfiles.com/ugd/b50c55_181a6a83bd49458f8b775e54ddf79f56.pdf
    • https://static.usrfiles.com/ugd/b8c837_61aead6d60824e048b7a574f62f2de6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_36865808e3de48bf84b4df5d9636c6a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68fe38d6d5c49fe9c11b01871f5692c.pdf
    • https://cdn.shopify.com/s/files/1/0438/3562/1536/files/64955002724.pdf
    • https://cdn.shopify.com/s/files/1/0457/6618/1020/files/broad_toe_formal_shoes.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_off00005f03.bin
ba89d1301fdf472413016d470fa9a60267eaae12d4aa716717186ca8a6966fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F03 5420 bytes
font_01_sfnt_off0000716d.bin
de59439c934cabe62c73e01b4c617a6b7964f6b35790ef84c75faaf6a3acca5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716D 11244 bytes

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