PDF malware analysis — malicious · 43aee8fde3edaf53

MALICIOUS

PDF

46.9 KB Created: 2021-05-14 01:22:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: fc3e618cb47bed252813e25752386df7 SHA-1: b92396a5b576f79d8830b31fc22e936079a61436 SHA-256: 43aee8fde3edaf539988649b6caa7c6a9ed50405e81d56606eee35ee46c2238a

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 the user into clicking a link, which is a common social engineering tactic. The embedded URL, https://netcdn.xyz/app/431946152/gain-robux-game-hack, likely leads to a second-stage payload download. While no scripts were explicitly extracted, the PDF structure and ML classification indicate malicious intent, suggesting exploitation for client execution.

Machine Learning

Nyx PDF Classifier malicious score 0.8948

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/gain-robux-game-hack
- https://www.impactfoods.co.uk/images/coin-master-free-spin-27_GM406889139.pdf
- https://www.impactfoods.co.uk/images/coin-master-hack-xyz-apk-download_GM406889139.pdf
- https://www.impactfoods.co.uk/images/free-robux-gen_GM431946152.pdf
- https://www.impactfoods.co.uk/images/free-roblox-acc_GM431946152.pdf
- https://www.impactfoods.co.uk/images/how-do-you-get-free-robux-without-paying_GM431946152.pdf
- https://www.impactfoods.co.uk/images/free-daily-spins-from-coin-master_GM406889139.pdf
- https://www.impactfoods.co.uk/images/free-coin-master-spin-daily-link_GM406889139.pdf
- https://www.impactfoods.co.uk/images/free-robux-android_GM431946152.pdf
- https://www.impactfoods.co.uk/images/can-you-make-a-minecraft-server-for-free_GM479516143.pdf
- https://www.impactfoods.co.uk/images/coin-master-hack-2021_GM406889139.pdf
- https://www.impactfoods.co.uk/images/how-to-change-your-name-in-roblox-for-free_GM431946152.pdf
- https://www.impactfoods.co.uk/images/coin-master-get-free-cards_GM406889139.pdf
- https://www.impactfoods.co.uk/images/how-to-hack-someone-on-roblox_GM431946152.pdf
- https://www.impactfoods.co.uk/images/free-online-spins-coin-master_GM406889139.pdf
- https://www.impactfoods.co.uk/images/free-robux-promo-codes_GM431946152.pdf
- https://www.impactfoods.co.uk/images/roblox-bux-free_GM431946152.pdf
- https://www.impactfoods.co.uk/images/hacker-coin-master_GM406889139.pdf
- https://www.impactfoods.co.uk/images/free-gifts-coin-master_GM406889139.pdf
- https://www.impactfoods.co.uk/images/robloxmatchcom-free-robux_GM431946152.pdf
- https://www.impactfoods.co.uk/images/free-robux-not-a-scam_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_003_off00004abb.bin` `c993aa36c4caed42422dbdfca6a06d4af9238eadaa718563d1d6430dc1ff694c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4ABB	25688 bytes
`font_01_sfnt_off00008691.bin` `f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8691	6100 bytes
`font_02_sfnt_off0000951c.bin` `43fcfc5ad65bddb23c39a51770cc0f9a79752509534f161ef5bee49844d3e761`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x951C	18200 bytes

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