PDF malware analysis — malicious · 941c616775211df5

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 23:21:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05

MD5: 30ebf592d1720dedc5e7d9cb24909b3f SHA-1: e11abb5b82e661a5647d267ca35494b6aa192852 SHA-256: 941c616775211df5e4a23d5a5b7c6773b70e32886f4257afa641a75d879f0939

90 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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/roblox-free-rubox-game-hack PDF link annotation
- https://cheryco.ir/assets/public/js/uploading/files/esp-hack-roblox_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/buy-robux-free_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/rbxboost-get-free-robux_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-robux-in-seconds_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-spin-ml_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/rbxcity-free-robux-instant-pay_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-robux-no-servery_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-go-300-free-diamonds-on-roblox-royale-high_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/roblox-cheat-download-no-survey_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/fort-wars-hacks-roblox_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-robux-com_GM431946152.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_off000031b5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31B5	22064 bytes
SHA-256: `32821065b8aebfc366cd47d402b9f5412cb28a466c4135f491d3436dca0a9428`
`font_01_sfnt_off00006287.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6287	18788 bytes
SHA-256: `240f26960413d3375b32b54d3a16c3eb3bd7324ec8649811f17e0fe1da2802cb`

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