PDF malware analysis — malicious · 3c3fc9efa7125877

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 16:50:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01

MD5: 7331c8408af51c26ce2ca59508539365 SHA-1: cb429c73dcd9c6ba8ba554aa871604ef35f4bab0 SHA-256: 3c3fc9efa7125877334e74e2d2ee7c8819e1439cb2708d78259f1d9302760d3f

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9797

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.online/app/479516143/tiktok-minecraft-hacks-game-hack PDF link annotation
- https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/vip-roblox-free_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/abd-roblox_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-free-body_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/pokemon-go-kanto-tour-free-version_GM1094591345.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-hack-com_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/minecraft-mod-menu_GM479516143.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
`font_00_sfnt_off00004fed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4FED	24604 bytes
SHA-256: `c95c28e7a75c2a72f304d159701fbf9265af1ef30ad2dfb3b679fd09a67b4aa4`
`font_01_sfnt_off000086f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x86F9	2940 bytes
SHA-256: `eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a`
`font_02_sfnt_off00009109.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9109	17880 bytes
SHA-256: `df7e49ec95a548ee0d23b7b279df4e27423bf5bf6641f50b7ca94314a26af21a`

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