Malicious PDF — malware analysis report

Static analysis result for SHA-256 4085829c57a09829…

MALICIOUS

PDF

34.5 KB Created: 2020-08-31 00:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b60e80fb5a0ad614ec0dc8a66bfde14 SHA-1: 9195575de28ce3ec902b1283bc58c2875e0c8163 SHA-256: 4085829c57a0982910770ce1b34c48907faf6d57ea038dddfbdca1168f10035b
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a malicious intent to lure users to external sites. The ML classifier also flagged this PDF with high confidence. 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.link/wix?keyword=ark+wooden+elevator
    • https://static.usrfiles.com/ugd/b91566_58d830e5f81d42ca95c2fb57f4f9485c.pdf
    • https://static.usrfiles.com/ugd/5899d5_94dcb89b397c476e84e35bfb8ee991fe.pdf
    • https://static.usrfiles.com/ugd/c1108c_658375b9b7cd4525a0eea6df300884ec.pdf
    • https://static.usrfiles.com/ugd/73c254_4788aa47f71043a2ab688aea8f2a33ba.pdf
    • https://static.usrfiles.com/ugd/625844_8d607a8d43094dec82bb750d5291363e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9c578f1fca946be8a8148f259330973.pdf
    • https://static.usrfiles.com/ugd/ab059d_91fd92a7cc04465b898ea564eb8524ba.pdf
    • https://static.usrfiles.com/ugd/77d535_e3f2893f56224f5ab03c0e4053b2c57c.pdf
    • https://static.usrfiles.com/ugd/e73fea_e3cdf2524cf24a6b827bba9cb25b52f0.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/2649676225.pdf
    • https://cdn.shopify.com/s/files/1/0430/9028/0609/files/43729918562.pdf
    • https://cdn.shopify.com/s/files/1/0435/8592/9375/files/6710191837.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9770/files/14323502121.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/life_selector_credits_premium_hack.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_off00004b54.bin
3283de4ba0841a4abbd9a7bd1e6d56e8bcf8e4b6cc44776aa7fa39acbe84f4d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B54 4844 bytes
font_01_sfnt_off00005bf5.bin
a8f9315b877ec12e2a52361d72b8d1fe1d8ee23c6b376d9ffc4431aba9be4a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF5 9896 bytes

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