PDF malware analysis — malicious · b319f61e4f72d648

MALICIOUS

PDF

43.1 KB Created: 2021-06-03 09:34:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 4a4a968cbfa071986a061f504faa6bbf SHA-1: bfef014945b0708f60d9a85933adbd2d2c83059a SHA-256: b319f61e4f72d6484ad74e896ff099ca76ac9551b823c6f05fdebd7dd6e36872

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains a lure for 'free Robux codes' and game hacks, directing users to a suspicious URL. The ML classifier also flagged the PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URI strongly suggest a phishing or redirection attempt to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

Heuristics 4

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.
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.online/app/431946152/free-robux-codes-not-used-game-hack PDF link annotation
- https://www.astrospace.com.tw/upload/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/robux-in_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/www-rubux_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/roblox-free-pets_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/rbx-com_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-on-roblox-2021_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_off00004eda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4EDA	23896 bytes
SHA-256: `5c5f02ba4cd2291bb7e9b58a0ac63c7cf0c4975d9186422a60a1e69e5fb4a97e`
`font_01_sfnt_off00008520.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8520	18480 bytes
SHA-256: `5e8837c19f720dc17ec1b2cb74db859cfc03e356d736a46bae75ba097655ce21`

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