PDF malware analysis — malicious · 8657cc505e3585e7

MALICIOUS

PDF

33.5 KB Created: 2021-07-09 03:01:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 11c92debcfb7b01b55560679d2d16e5a SHA-1: 6d197f5432e5a62eae272e94e79ed4fcf967fb9e SHA-256: 8657cc505e3585e70565105fbf06e8a51d49584e2b4c6f65af781065e27d29af

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/rbx-roblox-game-hack. This redirector is likely used to deliver further malicious content or phishing pages, disguised as game hacks or generators. The presence of a visual download button lure and the ML classifier's high confidence score further support the malicious nature of this document.

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/431946152/rbx-roblox-game-hack In PDF document text
- https://diendientuvn.com/public/upload/files/free-coin-master-glitches_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/how-to-get-admin-commands-on-roblox-hack_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/free-download-coin-master_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/roblox-free-50-robux_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/tiktok-famous-club-free-followers_GM835599320.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/galaxy-roblox-money-hack_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/roblox-hack-week-2021_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/how-to-have-free-robux-2021-and-exemple_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/pokemon-go-fest-free_GM1094591345.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
- https://diendientuvn.com/public/upload/files/is-it-impossible-to-get-free-robux_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_off00003153.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3153	21156 bytes
SHA-256: `2f169d10a64bec2785d13f3f9382ffe8204890437d99f3a6d3e934a069e35fc2`
`font_01_sfnt_off00005f8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F8A	18484 bytes
SHA-256: `f26455743a047e8df56ca1524d10cc4c18a922f3a9254ca202c5887b6dcb4309`

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