PDF malware analysis — malicious · 31b04c52a180a315

MALICIOUS

PDF

34.5 KB Created: 2021-06-27 10:28:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24

MD5: 6f4fd40e020c6e16c3c05094530e0da4 SHA-1: 38dd63949a7a0d529ac6d071a415e978e9ab3074 SHA-256: 31b04c52a180a3150a01d13c8b0f4fcfd5ecaaa5af8f7a23dae8ce6c315df989

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

PDF links to a 'free generator / game hack' redirector high 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.
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
External URI info PDF_URI

PDF contains an external URL action
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.co/app/431946152/roblox-reatai-tycoon-hack-game-hack PDF link annotation
- https://cursocejas.com.br/imagens/userfiles/files/roblox-robux-generator_GM431946152.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/changing-script-to-make-stuff-free-on-roblox_GM431946152.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/easy-roblox-today_GM431946152.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/free-roblox-injector_GM431946152.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/spin-and-coin-link_GM406889139.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/get-free-robux-with-promocodes_GM431946152.pdfIn PDF document text
- https://cursocejas.com.br/imagens/userfiles/files/como-hacer-hacker-en-roblox-2021_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_off00002f2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2F2E	22584 bytes
SHA-256: `a8068301c55e89c52f28ffef76a100e049fdaa3849ec96143935fd81959667ed`
`font_01_sfnt_off000061ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x61CA	19060 bytes
SHA-256: `cbb4ab5df3b9103270eaa4d3ed29c6f3395b12b9c19a190305b1d1a467035630`

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