PDF malware analysis — malicious · 1b36d21b2b52a859

MALICIOUS

PDF

36.7 KB Created: 2021-07-07 02:32:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: be19160734fc4553a2278e1cdf900471 SHA-1: 0972c60ead044afe8abe07836cdb2c48920fcc6a SHA-256: 1b36d21b2b52a8598b913df37132f2ad9162362fe01ac4d3fa3d64d5c36dc67a

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of game hacks and generators to trick users into clicking malicious links. The embedded URLs, such as http://netcdn.tw/app/406889139/coin-master-hack-app-2021-download-game-hack, redirect to further malicious PDF files hosted on ellobo.com.ua, indicating a chain of malicious content delivery. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and lure tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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
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 http://netcdn.tw/app/406889139/coin-master-hack-app-2021-download-game-hack In PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/1-000-subscriber-roblox-hack-tool_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/free-robux-picture_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/www-free-robux-hack-generator-club_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/hack-roblox-games-2021_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/how-to-get-free-robux-fast-and-easy-2_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/coin-master-hack-1021_GM406889139.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/free-followers-generator-roblox_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/is-roblox-hacking-illegal_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/how-to-get-free-thumbynail-in-roblox-studio_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/free-hair-roblox-not-decal_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/comment-cheat-sur-roblox-jailbreak_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/hack-roblox-robux-free-pastebin-com_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/free-robux-generator-only-enter-password_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/free-roblox-mod-menus_GM431946152.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
- http://ellobo.com.ua/ckfinder/userfiles/files/new-cheat-emgine-hack-roblox-jailbreak_GM431946152.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
`font_00_sfnt_off0000356e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x356E	23328 bytes
SHA-256: `12b6c70fecf2cce3626e0b930155f4df125a3af3bb3899b7cd0e5ae851f9d26c`
`font_01_sfnt_off000069f9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x69F9	19160 bytes
SHA-256: `08c3d26020315796c296df9400c9a2a920b0dbbe4ac3986bc7fb3bd2c9b27f96`

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