PDF malware analysis — malicious · c0dbdedfbff17101

MALICIOUS

PDF

43.3 KB Created: 2021-06-14 00:35:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18

MD5: 6e145fd1ced04ffcdf58589d7939457f SHA-1: a9b90ff864295c29dc0619b8ed118d4fdff294bf SHA-256: c0dbdedfbff171013492ed5cdc20a5ca5c89d2f6d1eb51e6ed207bd48e59a99f

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9969

Heuristics 5

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.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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/free-funny-roblox-avtras-game-hack PDF link annotation
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/ww-roblox-come_GM431946152.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/roblox-hack-app_GM431946152.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/spin-link_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/robux-prices_GM431946152.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-email-rewards_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
- https://lojasdoescritorio.com.br/ckfinder/userfiles/files/free-spins-for-coin-master-2021_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
`stream_003_off00004b2b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4B2B	25788 bytes
SHA-256: `904f6c417c61ee8bc02684f5fccaccb7c0e65fed375f9b74692e523f4beb5474`
`font_01_sfnt_off0000859e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x859E	18716 bytes
SHA-256: `c9e79525e67993f8a7c5004b58698074b4c8211626d8e8e3b90e855e11adfcc3`

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