PDF malware analysis — malicious · 8694ce9845417224

MALICIOUS

PDF

36.1 KB Created: 2021-07-04 07:05:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05

MD5: b19856a71a714971988605fe00af7c0e SHA-1: cb1f5e71ed9637da38381e83cd8d4ddc42e2095b SHA-256: 8694ce9845417224df80b7f07525290f342d3e058b32fd71783ac810e6e4c400

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a common lure of 'free Robux' or game hacks to entice users into clicking a link. The primary link, http://netcdn.tw/app/431946152/free-robux-no-downloading-apps-game-hack, is flagged as a high-risk redirector. While no scripts were explicitly extracted, the ML classifier and heuristic firings strongly indicate malicious intent, likely leading to a second-stage download or exploit.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-no-downloading-apps-game-hack PDF link annotation
- https://www.cgalgeria-dubai.com/userfiles/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/mega-roblox-hack-engine_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/free-robux-now_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/wurst-commands_GM479516143.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/how-to-play-coin-master_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/roblox-hacks-phantom-forces-2021_GM431946152.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
- https://www.cgalgeria-dubai.com/userfiles/files/coin-master-fan-page-free-spins_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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000321c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x321C	23276 bytes
SHA-256: `e78cb5f0fe065f64e2088a2e8d65e66c22cb52d5f0af04a8987ab4511dcd7607`
`font_01_sfnt_off00006689.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6689	19592 bytes
SHA-256: `a44ac9db15e9a0f689b658e0517c09d4447592c082fac33f635fa6b58c0bc840`

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