PDF malware analysis — malicious · 320fa81ab05b61e8

MALICIOUS

PDF

48.0 KB Created: 2021-06-08 22:30:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: de481073037f4793101b182d6da161d3 SHA-1: 4ee379e58aa9067bafe2c248a32b7b3745db44cc SHA-256: 320fa81ab05b61e84335a83d143bbf710b333e005f1f06bea635443d656a3f59

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure and a call-to-action button, directing users to a URL that promises free Robux. This is a common social engineering tactic to trick users into visiting a malicious site or downloading a payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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-no-buying-apps-game-hack
- http://muslib.unmus.ac.id//repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdf
- http://muslib.unmus.ac.id//repository/mobihack-roblox-hack_GM431946152.pdf
- http://muslib.unmus.ac.id//repository/best-free-robux-sites_GM431946152.pdf
- http://muslib.unmus.ac.id//repository/robloxfun-com-generator_GM431946152.pdf
- http://muslib.unmus.ac.id/repository/free-spin-link-of-coin-master_GM406889139.pdf
- http://muslib.unmus.ac.id//repository/robux-gift-card-free_GM431946152.pdf
- http://muslib.unmus.ac.id/repository/free-roblox-generator_GM431946152.pdf
- http://muslib.unmus.ac.id/repository/coin-master-free-gifts_GM406889139.pdf
- http://muslib.unmus.ac.id//repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdf
- http://muslib.unmus.ac.id/repository/free-old-roblox-accounts-pastebin_GM431946152.pdf
- http://muslib.unmus.ac.id/repository/coin-master-free-coins-amp_GM406889139.pdf
- http://muslib.unmus.ac.id//repository/how-to-get-free-robux-2021_GM431946152.pdf
- http://muslib.unmus.ac.id/repository/www-robux_GM431946152.pdf
- http://muslib.unmus.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdf
- http://muslib.unmus.ac.id/repository/free-robux-websites-that-work_GM431946152.pdf
- http://muslib.unmus.ac.id/repository/coin-master-home_GM406889139.pdf
- http://muslib.unmus.ac.id//repository/free-minecraft-coins_GM479516143.pdf
- http://muslib.unmus.ac.id//repository/free-spins-on-coin-master-2021_GM406889139.pdf
- http://muslib.unmus.ac.id/repository/free-robux-without-survey_GM431946152.pdf
- http://muslib.unmus.ac.id//repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.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_off000052e7.bin` `c1c6ec998663577b5b37f6f24bef7db7c9e401a1de6c800731a3c63908f56b81`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x52E7	24648 bytes
`font_01_sfnt_off00008acc.bin` `9234f5cbcec905a53192e69d00ec3904d37bfb23c8873e1cb138d11270814ba1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8ACC	3516 bytes
`font_02_sfnt_off00009735.bin` `1fbf49afd8e4a6387b99b0f4e050b3eb7108e882af17361a553d8d2724b69d44`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9735	18776 bytes

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