PDF malware analysis — malicious · bcad49c31c2efb5b

MALICIOUS

PDF

46.9 KB Created: 2021-06-10 14:19:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 78f944ed1222d9dd186fcffbb5f24ea7 SHA-1: c230f95916e411c7dfab7a83dec70e3a64d0a491 SHA-256: bcad49c31c2efb5b9a5aa6a24876a25f9a08760ada461fb99aa16e7ffa92d327

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with a link. This link, 'https://netcdn.tw/app/431946152/free-clothing-group-roblox-game-hack', likely leads to the download and execution of a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

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-clothing-group-roblox-game-hack
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-script_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/hack-and-get-a-roblox-account-banned_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/instantrobux-com-free-robux_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-money-glitch-on-roblox-on-car-simulator_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-robux-pins_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-free-limiteds-on-roblox-2021_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/roblox-a-bizarre-day-hack_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-free-things-in-robux-inspect_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/coin-master-free-blogspot_GM406889139.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-roblox-for-nikes_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-promo-codes-for-robux_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/descargar-free-robux-hack_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-tell-if-your-roblox-account-got-hacked_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-download-hacks-in-roblox-high-school_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/tiktok-followers-for-free_GM835599320.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/free-exploits-for-roblox-2021_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/fastbucks-me-robux-for-free_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-survey-no-offers_GM431946152.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/how-to-make-a-minecraft-server-for-free_GM479516143.pdf
- https://zbych-pol.pl/wp-content/uploads/fsqm-files/hacks-to-get-free-robux_GM431946152.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000506f.bin` `94c185b7d35d95bd526f20334d00371c56cee1830d99919faa1bad52a440b584`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x506F	23724 bytes
`font_01_sfnt_off00008617.bin` `9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8617	5596 bytes
`font_02_sfnt_off000092be.bin` `461c1617bfb84a56c8952062cb43f01fbcc245ed74d9880b6d0bba7f72ea42f0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x92BE	18940 bytes

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