Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cb414bd6268bd8…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 21:58:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 59f1df46a9deb7b9124e4b76f918f09b SHA-1: e2da054eb9b34d5d8e03852946458e95766ba6c7 SHA-256: 33cb414bd6268bd88dab3859c88af2520bde91aad1629d03715d4c931a19ac08
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links, many of which point to SEO-optimized PDF files hosted on js100.com, suggesting a link farm designed to attract users with promises of game-related hacks. The primary URL, https://netcdn.online/app/406889139/free-spin-link-coin-master-game-hack, likely serves as a lure for a malicious download. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/free-spin-link-coin-master-game-hack
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/simplysarc_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-rare-cards_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-coins-and-spins-app_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-capes-no-mods_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/roblox-report-hacker_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-link-spin_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/all-coin-master-spin-link-and-free-download_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/roblox-bloxburg-free-money_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-server_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/minecraft-education-free_GM479516143.pdf
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-xyz-download-free_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/free-robux-just-click_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/hackear-coin-master_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/how-to-actually-get-free-robux_GM431946152.pdf
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-apk_GM406889139.pdf
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-apk-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004dc5.bin
b1fe539ff6e933c23d57a61736adad2186ab0c066e3cf7166f680f24c91b4aff
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DC5 25364 bytes
font_01_sfnt_off0000880e.bin
5e0e5252c5991e876b89620e8fc451db275611f7bed2c8d0b16d9c89ed4fe559
pdf-font-stream PDF embedded font (sfnt) at offset 0x880E 18056 bytes