PDF malware analysis — malicious · 58d111b79d98a56a

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 04:30:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 32f1f707de51d6750742a3b93d85259f SHA-1: 5800999f12e2f7b27ea3edc5dfda5eebbd5450ae SHA-256: 58d111b79d98a56a2c49ea46dae180a4d1c2c6e50b3280a0b0e20539faafd262

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA to trick users into interacting with it, likely to initiate a download or exploit. The embedded URL points to a resource that promises free Robux, a common lure for malicious content. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit vulnerabilities or lead the user to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

Heuristics 4

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/free-robux-in-1-second-game-hack
- http://digilib.ulm.ac.id/pusat/repository/free-coins-coin-master-no-human-verification_GM406889139.pdf
- http://digilib.ulm.ac.id/pusat/repository/free-minecraft-texture-packs_GM479516143.pdf
- http://digilib.ulm.ac.id/pusat/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/minecraft-pe-mod-menu_GM479516143.pdf
- http://digilib.ulm.ac.id/pusat/repository/roblox-galaxy-arcade-free-ships_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/free-robux-images_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/coinmaster-free-spins-link_GM406889139.pdf
- http://digilib.ulm.ac.id/pusat/repository/infinite-robux_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-faces-on-roblox-2021-on-computer_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/roblox-download-free-on-ps4_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-easy-hack_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-hair-on-roblox-2021_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/free-coins-on-coin-master_GM406889139.pdf
- http://digilib.ulm.ac.id/pusat/repository/apps-that-give-you-free-robux_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/free-robux-com-2021_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/get-free-spins-on-coin-master_GM406889139.pdf
- http://digilib.ulm.ac.id/pusat/repository/roblox-promo-codes-for-free-robux_GM431946152.pdf
- http://digilib.ulm.ac.id/pusat/repository/is-minecraft-dungeons-free_GM479516143.pdf
- http://digilib.ulm.ac.id/pusat/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdf
- http://digilib.ulm.ac.id/pusat/repository/minecraft-hacks-pc_GM479516143.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00005108.bin` `758643aa479a8d53fbf0c531a4ee389c5d4f76c55d2680de04d0da7d3d097991`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5108	26236 bytes
`font_01_sfnt_off00008c71.bin` `dbca395558596f7d8e80b6f44ac32f4c1f77b8b31301a995b07f432fd11c1cea`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C71	18292 bytes

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