PDF malware analysis — malicious · 13e7ea043adb2604

MALICIOUS

PDF

45.4 KB Created: 2021-05-16 21:30:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: bdae8471dc35397d13ceadd8e3e53b4b SHA-1: c84524dddf3391ff9fd7b2260de30906d95b4911 SHA-256: 13e7ea043adb2604c1aa2ff12a5a3a3fca1e2140e40b920ff14e4f844a273aba

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with it, likely leading to the download of a second-stage payload from the embedded URLs. The ML classifier also flagged this PDF as malicious with high confidence. The presence of multiple URLs suggests a downloader or redirector pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9507

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.xyz/app/431946152/how-do-i-get-free-robux-game-hack PDF link annotation
- http://fourieredu.cz/files/ckfinder/files/actual-free-robux_GM431946152.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/www-rbxhut-com_GM431946152.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/roblox-character-free_GM431946152.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/free-robux-youtube_GM431946152.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/coin-and-spin_GM406889139.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/coin-master-hack-355_GM406889139.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/daily-spin_GM406889139.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/minecraft-net-free_GM479516143.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/free-robux-apk_GM431946152.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
- http://fourieredu.cz/files/ckfinder/files/robux-hack_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off000048bc.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x48BC	26568 bytes
SHA-256: `65fc47526a763022d87ca79d67ad3f3bb48b7ac6219c708d58192ba3fa8afcf8`
`font_01_sfnt_off0000849c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x849C	2840 bytes
SHA-256: `3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676`
`font_02_sfnt_off00008e4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8E4E	18452 bytes
SHA-256: `af4dc877dda7dbd9aa71ce66d9a52868b07d358fe63790b9b74aede2acb33558`

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