Malicious PDF — malware analysis report

Static analysis result for SHA-256 dececb20d429b5b2…

MALICIOUS

PDF

44.2 KB Created: 2021-05-19 06:39:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 09f55cc80e03e58b2748d00e8fd3c69c SHA-1: 342357325b44e7f7c4e0403ac1168e2f0c6cdc88 SHA-256: dececb20d429b5b257c90ff9497a4798da86547bf84d1ffc4d6f871a08c6b9f0
122 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and download lure, designed to trick users into clicking malicious links. The primary link, https://netcdn.xyz/app/431946152/robux-generators-that-actually-work-game-hack, and numerous other embedded URLs point to sites offering game hacks and cheats, which are common pretexts for malware distribution. The document's structure and content strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/robux-generators-that-actually-work-game-hack PDF link annotation
    • http://www.rewaqousha.net/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • http://www.rewaqousha.net/userfiles/files/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c31.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C31 25636 bytes
SHA-256: 5254d284f4b2d7fb1f7235d8189689d3e1a3a8e4492f6b85ce64a8ff984a7383
font_01_sfnt_off00008854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8854 18968 bytes
SHA-256: ddbdedd946da9c20f240abbed8bdf8c55517508d28d22b252adc9eca822b6901

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