PDF malware analysis — malicious · 818cc3a3114d7553

MALICIOUS

PDF

46.3 KB Created: 2021-06-03 08:58:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 20e896ef51e1c50a62dc4d6ae547e9a9 SHA-1: 1dafc3595ed63514bf7cc9f10fa41d8e6e930d46 SHA-256: 818cc3a3114d7553c3ae4e6671d3185baccee1dc3d7c19eafa396f189ab14a73

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 the document. It also embeds external URLs, one of which, 'https://netcdn.online/app/406889139/blogger-coin-master-free-spins-game-hack', is likely intended to host a second-stage payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/blogger-coin-master-free-spins-game-hack
- https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/free-minecraft-accounts-reddit_GM479516143.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-not-a-scam_GM431946152.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/apps-to-get-minecraft-for-free_GM479516143.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdf
- https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/how-to-get-roblox-money_GM431946152.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/twitter-coin-master-free-spins_GM406889139.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/free-robux-no-survey-no-download-2021_GM431946152.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/mobihack-roblox-hack_GM431946152.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/coin-master-hack-app-2021_GM406889139.pdf
- https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/como-hackear-coin-master-espaol_GM406889139.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/pubg-uc-buy-in-pakistan-jazz-cash_GM1330123889.pdf
- https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/free-robux-no-verify-2021_GM431946152.pdf
- https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/how-do-you-get-free-robux_GM431946152.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/coin-master-shield-hack_GM406889139.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/coin-master-hack-apk-no-survey_GM406889139.pdf
- https://ombalicargo.com/new/public/ckfinder/userfiles/files/roblox-free-robux-generator_GM431946152.pdf
- https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/coin-master-hack-pro-gamers_GM406889139.pdf
- https://www.ombalicargo.com/new/public/ckfinder/userfiles/files/free-robux-download_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_off00005100.bin` `82a25851fdd8d0ae129209f1ae3ab1b8f9109255290837e2df7f6bbd0fede0d2`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5100	24896 bytes
`font_01_sfnt_off00008794.bin` `d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8794	2868 bytes
`font_02_sfnt_off0000917f.bin` `0911799b9aa5b6ecf8f75e1ae71094da345a4ed5579c86b7800e8f9c3f9f610d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x917F	18464 bytes

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