Malicious PDF — malware analysis report

Static analysis result for SHA-256 67993a63a42eff8a…

MALICIOUS

PDF

43.7 KB Created: 2021-05-16 21:11:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e7fb6c28ccf5a5f4df1c73da86c335a7 SHA-1: 2da486db7a0185ee483c49f6d3e99c19d0ec52b7 SHA-256: 67993a63a42eff8a01bf4ea54c4b97cce0d86668c903a03e85062a0150ac2d84
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to other PDF files, indicative of a link farm or SEO spam campaign. One primary URL, 'https://netcdn.xyz/app/406889139/coin-free-spin-game-hack', is directly embedded. The heuristic 'PDF_SEO_LINK_FARM' and the ML classifier strongly suggest malicious intent, likely to drive traffic to potentially harmful content or exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://netcdn.xyz/app/406889139/coin-free-spin-game-hack
    • http://plastic-surgery.pl/images/blox-world-free-robux_GM431946152.pdf
    • http://plastic-surgery.pl/images/minecraft-hacks_GM479516143.pdf
    • http://plastic-surgery.pl/images/how-to-get-free-robux-no-scam_GM431946152.pdf
    • http://plastic-surgery.pl/images/how-do-you-get-robux-on-roblox_GM431946152.pdf
    • http://plastic-surgery.pl/images/coin-master-free-cards-link_GM406889139.pdf
    • http://plastic-surgery.pl/images/free-coin-spin-daily-link-net_GM406889139.pdf
    • http://plastic-surgery.pl/images/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • http://plastic-surgery.pl/images/coin-master-hack-download-ios_GM406889139.pdf
    • http://plastic-surgery.pl/images/is-there-any-way-to-get-free-robux_GM431946152.pdf
    • http://plastic-surgery.pl/images/coin-master-spins-hack-2021_GM406889139.pdf
    • http://plastic-surgery.pl/images/roblox-robux-hack-generator_GM431946152.pdf
    • http://plastic-surgery.pl/images/coin-master-free-cards-link-2021-today_GM406889139.pdf
    • http://plastic-surgery.pl/images/get-free-coins-on-coin-master_GM406889139.pdf
    • http://plastic-surgery.pl/images/wwwcoin-master-free-spincom_GM406889139.pdf
    • http://plastic-surgery.pl/images/coin-master-free-spins-hack-iphone_GM406889139.pdf
    • http://plastic-surgery.pl/images/minecraft-java-edition-free_GM479516143.pdf
    • http://plastic-surgery.pl/images/free-free-robux_GM431946152.pdf
    • http://plastic-surgery.pl/images/free-robux-generator-without-verification_GM431946152.pdf
    • http://plastic-surgery.pl/images/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdf
    • http://plastic-surgery.pl/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cf9.bin
52be4465d60a9c2e1c13f749f2b758e165529a66ff66bff4e9de8297076e248a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF9 30364 bytes
font_01_sfnt_off00008b36.bin
8dab29753a5a72b3c6b7a99730aed283de919e10e0bbccf431f5836ef96af8e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B36 17552 bytes