PDF malware analysis — malicious · 73c2f09632641d1c

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 07:03:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 8cdd8fff19455ae0b238eed9889d764b SHA-1: 0ea70a9cd3a9196201fffeeca44da148e73e0d7c SHA-256: 73c2f09632641d1cf80111913de723191a45791d0d3f54a087528d3fe1c92714

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.tw/app/431946152/play-free-online-games-roblox-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attack designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9864

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/play-free-online-games-roblox-game-hack In PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/inappropriate-roblox_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-com-real_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-free_GM479516143.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/tiktok-fame-free_GM835599320.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-do-i-get-100-robux-for-free_GM431946152.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
- https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-spins-for-coin-master-game_GM406889139.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_off0000535b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x535B	25392 bytes
SHA-256: `a32a308f16ac6b4465190dd2e129b9de1d635a803ee31a8e2f1810b88be9407b`
`font_01_sfnt_off00008df6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DF6	18892 bytes
SHA-256: `f30fa75fb396e30aff4202a3dac19d0d5eb9a60db55f709217c69deba1b4111b`

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