Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdc69ac1898b2e6…

MALICIOUS

PDF

44.2 KB Created: 2021-04-28 21:10:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0824dadd12b6e2fe79b379132759dd2a SHA-1: 1c3b6d45361311491b768af016dbad150e038f13 SHA-256: fcdc69ac1898b2e6945497a8b9d9543cc002a30565190c4b789a9da6bb44fb12
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free Robux generator' which redirects to the malicious URL https://netcdn.xyz/app/431946152/uirbx-club-free-robux-game-hack. This heuristic, combined with the ML classifier, strongly indicates a malicious intent to trick users into visiting a potentially harmful site. The document body also contains numerous other links related to Roblox hacks, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/431946152/uirbx-club-free-robux-game-hack PDF link annotation
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-full-throttle-hack.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/how-to-hack-other-roblox-accounts.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/boku-no-roblox-remastered-hack-chose-quirks.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/how-to-make-a-free-robux-hack.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/free-gamepass-roblox-script-not-patched.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-walk-through-walls-cheat-engine-jailbreak.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-money-hack-cheat-engine-63.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-2021-april-fools-hack.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/roblox-noclip-no-cheat-engine.pdfIn PDF document text
    • https://www.bolsoshf.com/ckfinder/userfiles/files/free-cookie-codes-for-roblox.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000040f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40F1 26588 bytes
SHA-256: 5e9df3f5a1c1ea327c1a32db4c4f6279ba9809896d5d027cb6f79cee5b970549
font_01_sfnt_off00007dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDA 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A81 18396 bytes
SHA-256: 84f625030a7f1f5286ae58a22daaf46a91611d6c747ac63487c4b5e2dd74d257