PDF malware analysis — malicious · e4ce1a0acb4952a8

MALICIOUS

PDF

35.3 KB Created: 2021-07-02 07:24:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01

MD5: 81959a4546a33db07e799a47df5afa5f SHA-1: c0929b21cf8eeb262ff884525671ccd3b7870b32 SHA-256: e4ce1a0acb4952a879fc6b0c417847ac05087eda059c7d8b17c4a91d8925333a

122 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 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.
Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE

PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
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/download-roblox-player-apk-free-game-hack PDF link annotation
- https://loba.com.vn/public/upload/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-robux-on-ipad-mini-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-the-scary-elevator-red-key-locations-cheat-sheet_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-hacks-for-rb-world-2_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-generator-no-survey-or-captcha_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/hack-for-robux-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-no-scam-or-hack_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/hackear-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-become-builders-club-on-roblox-for-free_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/claim-gg-earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-free-online-unblocked_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/a-hacker-is-threatening-me-roblox_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_off00003159.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3159	22176 bytes
SHA-256: `88cd62da9e0a77aa90d52a7627fcf6a384fe7572890be6f999317b15561fd70b`
`font_01_sfnt_off00006266.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6266	19836 bytes
SHA-256: `0cca0ac39e4b6b4e4a02be3ceb62905b35f7f5a443b2c76364723eb5fbd7b61c`

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