PDF malware analysis — malicious · 7f98a0e5d0fe2d80

MALICIOUS

PDF

39.5 KB Created: 2021-05-10 16:30:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05

MD5: 898dce888ffe5cade79d0964a101aa53 SHA-1: 2bd7701da572931595c20e2b6340c69b1ba9cf13 SHA-256: 7f98a0e5d0fe2d80c60d60a6fdfe661fb9fc0305284f17147db5fd810fabf9ab

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for a 'free Robux generator' and displays a fake CAPTCHA to trick the user into clicking a malicious link. The primary link, https://netcdn.xyz/app/431946152/free-robux-with-no-survey-game-hack, is presented as a way to obtain game currency. The document body and heuristics confirm the use of a fake CAPTCHA to encourage user interaction with the embedded malicious URL.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

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/free-robux-with-no-survey-game-hack PDF link annotation
- http://techmobil.pl/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
- http://techmobil.pl/images/rbx-hut_GM431946152.pdfIn PDF document text
- http://techmobil.pl/images/free-robux-glitch_GM431946152.pdfIn PDF document text
- http://techmobil.pl/images/free-roblox-website_GM431946152.pdfIn PDF document text
- http://techmobil.pl/images/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
- http://techmobil.pl/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
- http://techmobil.pl/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
- http://techmobil.pl/images/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
- http://techmobil.pl/images/coin-master-free-account_GM406889139.pdfIn PDF document text
- http://techmobil.pl/images/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
- http://techmobil.pl/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
- http://techmobil.pl/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
- http://techmobil.pl/images/free-minecraft-skins-ps4_GM479516143.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_off00003ee2.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3EE2	24356 bytes
SHA-256: `33c06747a5f346381605c7c10af84d1e887044ccf2f295420da62942f300bf79`
`font_01_sfnt_off00007660.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7660	18896 bytes
SHA-256: `c9a06fd84da7c680e9235c6c693ba85d62e2f793adf65e6d39442d95d7fb6fc9`

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