PDF malware analysis — malicious · df23b5ac757611b4

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 15:25:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01

MD5: 10d69f0b18da7ae76e1f546959520333 SHA-1: e72543ab3a02a6ac3d0099d72a041c148aa87216 SHA-256: df23b5ac757611b475e7c3bc790e06da7c504fec0e6f7f29826424101d0febd0

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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 0.9980

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.tw/app/431946152/free-robux-codes-generator-no-verification-game-hack PDF link annotation
- https://www.mentalhealthnow.co.uk/uploads/files/files/free-items-on-alo-roblox_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/comment-crer-un-hack-pour-roblox_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/how-to-hack-someone-on-roblox-and-steal-theyre-robux_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/free-robux-command_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/free-shirt-creator-roblox_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/freerobuxrobloxhacknosurveynohumanverification2021_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/roblox-dinosaur-simulator-hack-script_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/hack-roblox-dragon-ball-rage-anti-kick_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/roblox-free-items-2021_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/roblox-free-play-without-download_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/how-to-get-things-on-roblox-for-free_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/roblox-script-hack_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/roblox-level-7-hack_GM431946152.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/minecraft-items_GM479516143.pdfIn PDF document text
- https://www.mentalhealthnow.co.uk/uploads/files/files/roblox-phantom-forces-hack-credits_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_off000032e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x32E8	21356 bytes
SHA-256: `6c93f3d4528b0efd30f2908920785a076a45906eac4497278f815133f38acf94`
`font_01_sfnt_off00006173.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6173	19248 bytes
SHA-256: `ae2c0d8972e31d5fd2442df1a166e7aa138b9e721d28ea80a1459ad28ac3a5a0`

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