PDF malware analysis — malicious · 0b77d60eb89c2df4

MALICIOUS

PDF

50.1 KB Created: 2021-06-03 10:03:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07

MD5: 9686bb757bebb342f55a27d2322e66d3 SHA-1: 09276f02c4cb62f86f4637f6ed37d6519dc8deff SHA-256: 0b77d60eb89c2df4ed0bdfc074d7211c48840cce7895fb34f356cc375066ffbc

90 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and links to external URLs that promise game hacks and free currency. The ML classifier and specific heuristics indicate malicious intent, likely to trick users into downloading a second-stage payload or visiting a phishing site. The embedded JavaScript stream is a common method for executing malicious code within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9789

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 https://netcdn.online/app/406889139/how-to-hack-coin-master-game-2021-game-hack PDF link annotation
- https://cheryco.ir/assets/public/js/uploading/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-see-chegg-answers-free-tiktok_GM835599320.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/pokemon-go-free-spoofer_GM1094591345.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/hack-coin-master-1_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/easy-robux-today_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-roblox-scripts_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/earn-robux-now_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-robux-website_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/unlimited-robux_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/roblox-robux-hack-generator_GM431946152.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.

Filename	Kind	Source	Size
`stream_004_off0000540e.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x540E	30424 bytes
SHA-256: `1964e134759dd83456664ec1b2ae21e1bea46db79390c19fd1a8c3bc1cce3a85`
`font_01_sfnt_off00009322.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9322	2840 bytes
SHA-256: `3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676`
`font_02_sfnt_off00009cd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9CD4	19708 bytes
SHA-256: `156d5c65a3141f83c8f7afc348df53df31d1894ea2c34f5f14de1c0654dbf8b0`

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