PDF malware analysis — malicious · aa819755caf323a0

MALICIOUS

PDF

48.3 KB Created: 2021-06-07 03:42:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-07

MD5: fb278f00d1a93ed4699e33c817191d6c SHA-1: 2a356555b99d7074766060c4de3a89f2d846e105 SHA-256: aa819755caf323a03dafd177289a08d9aa39ced4b89a7c52d9b036c8bb67535c

160 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/how-to-get-free-robux-for-free-in-2-mins-game-hack In PDF document text
- https://naturenz.vn/public/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/coin-master-gift-hack_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/free-robux-com_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/roblox-tix-generator_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/free-free-robux_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/free-roblox-scripts_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/robux-websites-2021_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
- https://naturenz.vn/public/files/roblox-premium-free_GM431946152.pdfIn PDF document text
- https://naturenz.vn/public/files/play-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://naturenz.vn/public/files/minecraft-life-hacks_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
`stream_004_off00005031.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5031	26792 bytes
SHA-256: `419e9686bedc70d33b13cf008a4626cb0381cc81bb6b8c170e9c9739650dc29a`
`font_01_sfnt_off00008ed0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8ED0	2880 bytes
SHA-256: `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`
`font_02_sfnt_off000098bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x98BB	18724 bytes
SHA-256: `99c741774ce6805abe198b80e9d064775c09da108ef051218dc7886f5e0b06eb`

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