PDF malware analysis — malicious · 82b13af6daf4fdad

MALICIOUS

PDF

46.1 KB Created: 2021-06-10 23:04:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22

MD5: 13204f319f389ea9984b2a642c8c2827 SHA-1: 7bf74fb1fc3a894a5ee1bd623e85a021d4a3bf9d SHA-256: 82b13af6daf4fdad6492ea55492ba1da2d051cd869c7dee34bc77e5173dd173c

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 0.9864

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 https://netcdn.tw/app/431946152/how-to-get-free-robux-on-ipad-mini-2021-game-hack PDF link annotation
- https://loba.com.vn/public/upload/files/rbx-website_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/download-coin-master-hack_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-tracker_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/7-year-old-roblox_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/minecraft-hack-mod_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-tiktok-followers-no-survey-or-verification_GM835599320.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-roblox-com_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
`stream_004_off00005201.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5201	25964 bytes
SHA-256: `5a35e6d92e6f673583b5bd8c1a549e0a144aefb9d1ae96a8127fcd93c59c34e2`
`font_01_sfnt_off00008dc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DC9	19576 bytes
SHA-256: `8970abb7d9a494afdc96c07e5674c60e39595ec9939f8779d143301101c97b3b`

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