PDF malware analysis — malicious · a239d496ea2d139d

MALICIOUS

PDF

42.9 KB Created: 2021-05-13 08:30:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 455b5a77ddbe1cebc49094f397e29f89 SHA-1: e73d82d3f7423ca1545243ad008d310a5b6c4e80 SHA-256: a239d496ea2d139d2b640e6e92b1ed75ab4a0db9e9fef1020463e4054f41e96e

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document employs a fake CAPTCHA and a 'free Robux' lure to deceive users into clicking malicious links. The primary link, https://netcdn.xyz/app/431946152/how-to-get-robux-for-free-2021-game-hack, is associated with a game hack redirector, suggesting a potential path to malware delivery or a phishing scam. The ML classifier strongly flagged this PDF as malicious, reinforcing the observed social engineering tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/how-to-get-robux-for-free-2021-game-hack PDF link annotation
- https://cdu-lengerich.de/images/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
- https://cdu-lengerich.de/images/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
- https://cdu-lengerich.de/images/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
- https://cdu-lengerich.de/images/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
- https://cdu-lengerich.de/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
- https://cdu-lengerich.de/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://cdu-lengerich.de/images/coin-master-100-spin_GM406889139.pdfIn PDF document text
- https://cdu-lengerich.de/images/coin-master-code-hack_GM406889139.pdfIn PDF document text
- https://cdu-lengerich.de/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
- https://cdu-lengerich.de/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
- https://cdu-lengerich.de/images/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
- https://cdu-lengerich.de/images/give-me-free-robux_GM431946152.pdfIn PDF document text
- https://cdu-lengerich.de/images/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
- https://cdu-lengerich.de/images/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
- https://cdu-lengerich.de/images/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
- https://cdu-lengerich.de/images/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
- https://cdu-lengerich.de/images/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
- https://cdu-lengerich.de/images/roblox-hack-com_GM431946152.pdfIn PDF document text
- https://cdu-lengerich.de/images/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
- https://cdu-lengerich.de/images/coin-master-free-coins-link-2021_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_off0000489e.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x489E	25672 bytes
SHA-256: `d2324574392ed3fa33c6c844c75d9ab1ba403e4a74a1673716327966cc220f72`
`font_01_sfnt_off00008408.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8408	18684 bytes
SHA-256: `65f445f0396e54760dd2a1edc1744209422bc48f29c35ea74a9bcb72e79f8b06`

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