PDF malware analysis — malicious · 1cbb5f2fcbb6e391

MALICIOUS

PDF

51.0 KB Created: 2021-06-10 18:02:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 377636370d1d4137a3ccf18bf9992609 SHA-1: 438594c1473a510ffd399a88bc88aa336ddf3ec4 SHA-256: 1cbb5f2fcbb6e391725011194532eba0a42399791e070af1717eeb22ff315d35

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA and a download lure to entice users to click on a malicious URL. The primary URL, https://netcdn.tw/app/431946152/free-robux-gift-card-codes-december-2021-game-hack, is likely a redirector to a payload. The document's content and heuristics strongly suggest it's designed to trick users into executing further malicious code.

Machine Learning

Nyx PDF Classifier malicious score 0.9871

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.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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.tw/app/431946152/free-robux-gift-card-codes-december-2021-game-hack PDF link annotation
- https://mtsn4blitar.online/__statics/gudangsoal/files/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/minecraft-realms-free_GM479516143.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/easy-robux-hack_GM431946152.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/free-youtube-tiktok-dance_GM835599320.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://mtsn4blitar.online/__statics/gudangsoal/files/hack-coin-master-apk-358_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_004_off00005039.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5039	36792 bytes
SHA-256: `5c40153681d68aa484354f7bbc06e974df960302b1909bb86c99376770c2ab32`
`font_01_sfnt_off0000a167.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA167	19472 bytes
SHA-256: `d86d616e8a807baaf55c14cdf0f142f4cbd5d6a4f9068f51b90f6d6adb3914f4`

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