Malicious PDF — malware analysis report

Static analysis result for SHA-256 da80fed5a18bd7c2…

MALICIOUS

PDF

56.7 KB Created: 2020-08-31 14:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97e8080318b2623c1fcb0a0421501b20 SHA-1: 5bd07d75546b2bdce177fec160570455f8030012 SHA-256: da80fed5a18bd7c21ba4162f4f875b6eb41cf6b1142d4d39cb21d0c6ea7aa88a
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=balisong+tricks+pdf'. This indicates an attempt to lure the user to a malicious site. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs, suggesting a link farm or redirection strategy. The ML classifier strongly supports the malicious nature of this PDF.

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=balisong+tricks+pdf
    • https://static.usrfiles.com/ugd/b8c837_b97a0e3b72dc47ab8d3b8cce4610559d.pdf
    • https://static.usrfiles.com/ugd/10e3af_753e56647d684a399c4950601ec92ee3.pdf
    • https://static.usrfiles.com/ugd/b8c837_23ff7ac0614c439492cf69df7c255c09.pdf
    • https://static.usrfiles.com/ugd/cf14a4_15b9aa6ce2bc474fa5e883cfc922a570.pdf
    • https://static.usrfiles.com/ugd/b8c837_af6b54b025fe416da52ec83a393ae1ad.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/tsa_computer_based_test.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6553/files/puvijijojul.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/10696178461.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/87031011592.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/rodijefoj.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/82162458832.pdf
    • https://cdn.shopify.com/s/files/1/0429/0838/5439/files/12613376807.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/kawijejutenojexefo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009128.bin
39d964f7cfceabee646061227e1d47505b5268c611c6aca669268008db910d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9128 5104 bytes
font_01_sfnt_off0000a288.bin
3bf1d7de058e874a4ab559a847d8694895d7acc6c03ad25400fc523d3d49ac5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA288 11508 bytes
font_02_sfnt_off0000c831.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 4324 bytes

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