PDF malware analysis — malicious · 17c9117204761d35

MALICIOUS

PDF

35.7 KB Created: 2021-07-06 06:32:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: f0ec75bf358c6e68be2c4af28e725ff3 SHA-1: 017e921a674b909bbf395221f6a290416e42448c SHA-256: 17c9117204761d353f9631cdae5c9e4f2be00ae1f57db2130b7c86845847aaf0

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a malicious link disguised as a 'game hack' or 'free generator'. The link, http://netcdn.tw/app/406889139/what-is-coin-master-app-game-hack, leads to known malicious redirector infrastructure. The document also exhibits characteristics of an exploit, indicated by the malformed stream length heuristic, suggesting it may attempt to exploit a PDF vulnerability to execute code. No scripts were extracted, but the overall structure and heuristics point to a lure designed to trick users into visiting a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/what-is-coin-master-app-game-hack In PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/mad-city-roblox-hack-script_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/hack-roblox-controlar-jugadores_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/robux-unlimited-hack_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/deep-chills-run-free-roblox-id_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-pass-hacker_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-girl-hair-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-free-game-free-to-play_GM431946152.pdfIn PDF document text
- https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/exploit-hacks-roblox_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_off00003453.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3453	23216 bytes
SHA-256: `7de3c1765db15dfc0a1c01b2fc8b5b7eff0ffe6e5b3080bebd8251647bc9fa49`
`font_01_sfnt_off000068a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x68A4	18372 bytes
SHA-256: `f79d9c035a1551b94357c3965ae3dcfcb493fedbf82fb2bf8e4d4d60176c4376`

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