Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cef9363e595bc3f…

MALICIOUS

PDF

76.4 KB Created: 2020-08-05 14:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4300333201a19b5311ad2b41fe67466 SHA-1: 7433957963a950c38f4f834d9c0ab238cd3f5aad SHA-256: 3cef9363e595bc3f6fb18b55bfc5d1e689a2136aaaea95402d16f84cea19fe35
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and references 'maths quadratic equations pdf', suggesting a lure to disguise malicious activity. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=maths+quadratic+equations+pdf
    • http://files.photocolorongraphics.org/uploads/1/3/1/6/131606807/zodulekavemojewi.pdf
    • http://files.beyourbe.com/uploads/1/3/1/6/131607522/5829055.pdf
    • http://files.newseasonwc.com/uploads/1/3/1/0/131071157/3821101.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0912/files/javascript_array_remove_duplicates.pdf
    • https://cdn.shopify.com/s/files/1/0435/8435/6507/files/1421746083.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/gatodefemozugeva.pdf
    • https://cdn.shopify.com/s/files/1/0428/4533/9814/files/88829805176.pdf
    • https://cdn.shopify.com/s/files/1/0433/4410/1544/files/90654522885.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/38447067405.pdf
    • https://cdn.shopify.com/s/files/1/0432/3003/6123/files/basic_algebraic_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/duzegurodaxezakojilav.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2245/files/wonajo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1820/7911/files/leer_in_the_preterite.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/gononepekumikuruvusin.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/17842610988.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_off0000c71b.bin
ff5b055966c259348f1cbaa28134b60df9379313edd7514c3bc8a41ee5b22f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC71B 5340 bytes
font_01_sfnt_off0000d94c.bin
fcbb2bd55ffc4255a6422c7aaf37afc7f84f793b171f662f594ba9f00dd96d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 17276 bytes
font_02_sfnt_off00010f51.bin
379d44e8c2f250d662a0e9b59e9e45fd1baad7f6efae186e6c8c0f0726464a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 16156 bytes

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