Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcbf3520836c5dd…

MALICIOUS

PDF

38.9 KB Created: 2020-09-08 13:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3875f373c41e52df783693a9c537022 SHA-1: 2ffe6a011fa347cdeedaaf79436863e553fe3d04 SHA-256: cdcbf3520836c5dd4f5a3f5bcf6cfce41e2c44d4a5605e6c1db17256edc44ba1
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that is designed to trick users into downloading further content. The PDF also contains a large number of embedded links, many of which point to Shopify, suggesting a link farm for SEO poisoning. 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.me/wix?keyword=bacteria+and+virus+worksheet+6th+grade
    • https://cdn.shopify.com/s/files/1/0434/4145/5261/files/joxilubedosibaxunupikumug.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/cancionero_guitarra_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/19240347696.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/microsoft_office_access_free_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5829/files/banugelobomewiza.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/6410099870.pdf
    • https://cdn.shopify.com/s/files/1/0437/0304/2216/files/xawamukevolip.pdf
    • https://static.usrfiles.com/ugd/77941b_e30cf1f3b509494eae6ddf6d2361b8a4.pdf
    • https://static.usrfiles.com/ugd/c1108c_dbf13599d1a84845a82ca501a1db395b.pdf
    • https://static.usrfiles.com/ugd/345929_3c9babfcf4004fefb6118da7315a50e1.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_off000059e9.bin
67c570ce2a9dd0fdc63216bfdca802d48e94eb1a01fa7ec0e4de1a235cf70c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E9 5588 bytes
font_01_sfnt_off00006cff.bin
67dd9d26ff119a8e7ff057e9a4eaf8f73278040596c75fb4f433860167a2c345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFF 9984 bytes

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