Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fb0417a9d522bd…

MALICIOUS

PDF

33.0 KB Created: 2020-08-30 11:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a746568df4ccc811668b8fcb35f46f9c SHA-1: 5b875282f99a7d2967935f7aefb915138c95713a SHA-256: e0fb0417a9d522bdcc4752ac2aff433e2d809673862bf0a2ea60acd7f142f46d
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. 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.club/wix?keyword=westward+expansion+study+guide
    • https://static.usrfiles.com/ugd/b8c837_3ba1575a95e042ae8e625d3dd533067c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7e816df90f84078a149fb3bc402d79b.pdf
    • https://static.usrfiles.com/ugd/bb13a2_97c93aa91c99487b8e4ad78ccc9e3c01.pdf
    • https://static.usrfiles.com/ugd/b8c837_571338f8de2840c8824c13cd15b6d5be.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd6a537d197e47ecace9196b05d4a6a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_06c2953bfe0242299008cf429c93311e.pdf
    • https://cdn.shopify.com/s/files/1/0431/5765/1613/files/the_last_jedi_metacritic.pdf
    • https://cdn.shopify.com/s/files/1/0430/4814/0949/files/jewegoxuwizexudiduxopigo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/2682226210.pdf
    • https://cdn.shopify.com/s/files/1/0450/2175/7590/files/dry_matter_determination.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/9848514530.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_off00004240.bin
9f37897b3097b1b22d33fa126abab18bcfa64a02e8e24b713e948ad368f4f487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4240 5368 bytes
font_01_sfnt_off000054bb.bin
f39834d905357a09c072a92eb00b7ddf39ea1a1a5ea1d21887fee6d6efc38cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54BB 10196 bytes

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