PDF malware analysis — malicious · 31d389b7c5fd19e9

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 12:05:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: c5b4ac857bcabcfca916f7bf46af5e47 SHA-1: 2efe9e9adf15782dbe030bf930b8c6506939db85 SHA-256: 31d389b7c5fd19e9c2cff798da7ca40f52e879d41138e68a2c47f298ae2222ae

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising 'free TikTok likes generator game hack'. The ML classifier also flagged this PDF with high confidence. The document body and heuristics indicate a lure to trick users into clicking the malicious link, likely leading to further malware download or phishing.

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/835599320/free-tiktok-likes-generator-game-hack In PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/easy-robux-com_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/free-tiktok-views-trial_GM835599320.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/make-your-own-roblox-avatar-for-free_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-cheat-engine-noclip-2021-august_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-generator-no-email_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-codes-2021-not-used-no-verification_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-free-custom-song-game_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/hacker-des-personne-sur-roblox-pc_GM431946152.pdfIn PDF document text
- https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-get-free-dress-in-roblox_GM431946152.pdfIn PDF document text
- https://www.bbc.com/news/world-asia-china-46803909In 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_off000032ea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x32EA	22280 bytes
SHA-256: `6a9424028ac38f0d50f87638bf0bad7b9298ac9e656e21294df853887fede913`
`font_01_sfnt_off00006459.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6459	17972 bytes
SHA-256: `618fba9bb23b96ed94c7fbb241629ee71f2b54e5c39ad0cd0b25302c91d286cb`

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