PDF malware analysis — malicious · e840422eb57b49c9

MALICIOUS

PDF

35.3 KB Created: 2021-06-26 19:23:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05

MD5: db7d2dba7031cac80ec7caaec6d1a76c SHA-1: 4bc8c1df66e66a42c99541a99e37117c04f06726 SHA-256: e840422eb57b49c9ec5a22dac043a1deee12b881f3a29547307aaa2851eb27ff

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.co/app/431946152/roblox-btools-hack-2021-download-game-hack PDF link annotation
- https://loba.com.vn/public/upload/files/hack-my-roblox-acount-now_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/jailbreak-script_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-hack-siteleri_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/flying-hacks-for-roblox-survivor_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/one-for-all-free-shop-t-schirts-roblox_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/hack-roblox-comment-passer-a-travers-des-murs-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-roblox-hack_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/como-hackear-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/buy-tiktok-followers-free_GM835599320.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-hack-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-roblox-clothes-sites_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/speed-hack-on-roblox-jailbreak_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_off00003137.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3137	22228 bytes
SHA-256: `412b992e56e711f13491f8b81018efffe6057742ffd5cb10af3c8d06330ec627`
`font_01_sfnt_off000062b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62B0	19668 bytes
SHA-256: `b3fb894e98e17ba52d0f39da9f2f3ed9ad9d1c25555bfda274e22671ccc29cc4`

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