PDF malware analysis — malicious · 2b588f76f1c5b4ef

MALICIOUS

PDF

45.9 KB Created: 2021-05-10 16:53:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07

MD5: bfa693396bb162b0f9b9723471644fa6 SHA-1: 52edce0fa80b33e7898c1b5e2e8e53be152029bb SHA-256: 2b588f76f1c5b4efd5b46d6439f6096b51b31b4f6877b664fa37234f76d77e68

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which point to websites offering game hacks and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9432

Heuristics 6

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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.xyz/app/406889139/coin-master-free-spin-trick-game-hack PDF link annotation
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-limiteds-roblox_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/roblox-free-rubox_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_003_off00004c25.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4C25	25676 bytes
SHA-256: `0a95bbceb75cbc7d1c806b323cd30c904b291d832302916b8b0190ae700b347b`
`font_01_sfnt_off000086df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x86DF	18056 bytes
SHA-256: `54328088f56ee84842563079cfbb4138b7af9e8e3dfce622dd41e9898fc344b8`
`font_02_sfnt_off0000a828.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA828	3264 bytes
SHA-256: `e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088`

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