PDF malware analysis — malicious · 3d8f40b6d738768a

MALICIOUS

PDF

34.7 KB Created: 2021-06-29 07:21:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: ab3b72b5e148799fdcd328962c5c2faa SHA-1: ba75a172f5b555556ef45cfe77d2b5a9292821af SHA-256: 3d8f40b6d738768a4294ecbb3a6744d31f0ab86cb2bdda2098e4e1786a738bad

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to trick users into clicking a link. The primary link directs to a known malicious redirector infrastructure, likely serving as a gateway to further malicious content or downloads. No scripts were extracted from this sample, but the embedded URLs and heuristic firings strongly indicate a phishing or scam 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.co/app/431946152/free-100-robux-gift-card-codes-2021-game-hack In PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/roblox-get-free-robux-obby_GM431946152.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/roblox-top_GM431946152.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/minecraft-login-free_GM479516143.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/roblox-legend-of-the-fallen-kingdom-2-rpg-cheats_GM431946152.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/hack-coin-master-net_GM406889139.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/arsenal-fly-hack-roblox_GM431946152.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/roblox-hunger-games-hack_GM431946152.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/back-to-hack-roblox-id_GM431946152.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/free-robux-2021-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/free-items-on-roblox-pastebin_GM431946152.pdfIn PDF document text
- https://www.unicor.co.th/assets/editoruploads/files/minecraft-pe-free-download-ios-no-jailbreak_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
`font_00_sfnt_off000030be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30BE	21828 bytes
SHA-256: `4818fc7426c5d4ee18aba80e5f73c03e1190de2e5b2a468435587ed9be8dab5a`
`font_01_sfnt_off000060d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60D8	19516 bytes
SHA-256: `0f14fdcfe78292794fd5a1967a38a355fc2cd0c06564699bef2335bed5a810b4`

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