PDF malware analysis — malicious · 4a38790ce8d6a9c2

MALICIOUS

PDF

44.0 KB Created: 2021-05-14 07:35:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 41983d6ac3778e11388e5aced3813efb SHA-1: 9dc9eee4075e99ba0aaddbf57f37dba4a9887fc5 SHA-256: 4a38790ce8d6a9c2d1d9802e45b7d4d0e4a5b38069ae10233cc8cab7ca9762f7

110 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and links to external URLs that are designed to lure users into believing they can obtain free game currency or hacks. The ML classifier strongly indicated maliciousness, and the presence of embedded JS suggests an attempt to execute further malicious code or redirect the user to a malicious site. The primary lure is related to 'free Robux' and game hacking.

Machine Learning

Nyx PDF Classifier malicious score 0.9969

Heuristics 6

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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/431946152/how-do-u-get-free-robux-game-hack PDF link annotation
- https://cheryco.ir/assets/public/js/uploading/files/roblox-rewards_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-robux-rewards_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/roblox-avatar-free_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-spins-in-coin-master_GM406889139.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/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/real-robux-generator_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/fb-coin-master-hack_GM406889139.pdfIn PDF document text
- https://cheryco.ir/assets/public/js/uploading/files/free-minecraft-java-edition-account_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/coin-master-free-spins-link-2021-today_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
`stream_003_off00004b6d.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4B6D	27028 bytes
SHA-256: `c17ccd9983bdae7c929cf132f0f6f76a84d1f60293500a32ed2b4bdc08985180`
`font_01_sfnt_off00008875.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8875	18636 bytes
SHA-256: `ab6f51fdb1eed883fd21dff3bd0336e3a1b816e6c21a8924207bfe84ed9a007e`

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