PDF malware analysis — malicious · c3261b1ae97b1c85

MALICIOUS

PDF

45.2 KB Created: 2021-06-07 15:03:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 47bad0f6feea6ad5d1c0b01098d98d40 SHA-1: 8eb1c5817be9be70d63338e42a11b739345ace70 SHA-256: c3261b1ae97b1c8591f509e50a0b4dd3a846e25d0fdcb0ae654a13adb8214dcb

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains a malicious redirector link disguised as a "free generator" or "game hack" offer, aiming to trick users into downloading further malicious content. The document body and embedded URLs strongly suggest a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and malformed stream length heuristic indicate exploitation of PDF vulnerabilities, likely to facilitate the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9890

Heuristics 5

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.
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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/free-robux-and-tix-2021-game-hack In PDF document text
- https://purihostel.com/assets/CKImages/files/easy-robux-hack_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/descargar-un-hacks-para-roblox_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/wurst_GM479516143.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/oprewards-login_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
- https://purihostel.com/assets/CKImages/files/how-to-earn-robux-fast_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_off000053cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x53CF	24700 bytes
SHA-256: `49e8f64797514611f0995dffbdce434b36c009be038af365dfff19f620f62eaf`
`font_01_sfnt_off00008cb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8CB4	18712 bytes
SHA-256: `94a81bfdf22214de2d72186491ce1ec7ba4e5f9dc1408534d4720ec716a4119d`

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