PDF malware analysis — malicious · 443768ee09776217

MALICIOUS

PDF

36.3 KB Created: 2021-07-07 04:51:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 47ab56e0709ade83d26576c278cffc04 SHA-1: 4e50f41ce2bfa90e3ec3b33f423584bd3280d5e7 SHA-256: 443768ee097762171e332af5df8cf27afded3d4e5be1d24cc218bfda45a1aae1

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/spin-free-coin-master-game-hack, which is presented as a 'free generator / game hack'. The document body and embedded URLs reinforce this lure, aiming to entice users to click through to potentially malicious content. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of a phishing or malware distribution attempt.

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/spin-free-coin-master-game-hack In PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-free-wings-in-roblox-2021_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-emojis-that-work-on-roblox-servers_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-images-free_GM479516143.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-a-free-diablo-on-ud-westover-roblox_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-fan-club_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/tiktok-editor-free-download_GM835599320.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-robux-hack-no-survey-or-download-2021_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-70-robux_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-roblox-gift-card-codes-november-2021_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/cheat-hide-and-seek-roblox_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/can-tiktok-free-view-bot_GM835599320.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_002_off0000385f.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x385F	23060 bytes
SHA-256: `29dd04870d16d2935ebfe252b491a5d2bdf52c911a803a46e89888cd117651f7`
`font_01_sfnt_off00006bed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BED	18176 bytes
SHA-256: `8b68a35672d5b21ea29aeea640c198d2f03cb2d1fa451451c8ac02328cee2fb7`

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