PDF malware analysis — malicious · f582d9433feb6e36

MALICIOUS

PDF

50.3 KB Created: 2021-06-10 22:45:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: 6aaea0b1d7d19c27275f9768e76e72d6 SHA-1: 2dedb385d28aa83d22a4c4dfbd9745a879e6f05a SHA-256: f582d9433feb6e368b3e7a630406768004d998210aeb1433131a3ed37b8a8626

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, which is a common social engineering tactic. It also contains an embedded URI pointing to a URL that likely hosts a malicious payload. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9871

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/get-any-roblox-item-for-free-new-2021-working-legit-game-hack
- https://www.knjigebuducnosti.com/files/robuxian-free-robux-website_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/coin-master-firebird-card-free_GM406889139.pdf
- https://www.knjigebuducnosti.com/files/how-do-we-get-free-robux_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/free-robux-without-verification-or-survey_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/free-minecraft-skins-java_GM479516143.pdf
- https://www.knjigebuducnosti.com/files/how-to-get-real-robux_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/minecraft-linux-free_GM479516143.pdf
- https://www.knjigebuducnosti.com/files/blox-fish-free-robux_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/somebody-hacked-my-roblox-account-prestonplayz_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/free-spins-for-coin-master-2021_GM406889139.pdf
- https://www.knjigebuducnosti.com/files/krnl-download_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/how-to-get-free-robux-as-a-kid_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/pokemon-go-free-account_GM1094591345.pdf
- https://www.knjigebuducnosti.com/files/free-online-games-like-minecraft_GM479516143.pdf
- https://www.knjigebuducnosti.com/files/free-robux-without-human-verification-2021_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/roblox-hack-tool_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/robuxlove-net-free-robux_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/roblox-com-free-robux_GM431946152.pdf
- https://www.knjigebuducnosti.com/files/free-robux-codes-generator_GM431946152.pdf
- http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off0000504a.bin` `04ee46db153473a170e87aaffdae646c85a615273829e8c6ffbb24b2862045a7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x504A	34824 bytes
`font_01_sfnt_off00009dbe.bin` `be61a900c0351c6cb939d09bbd01cd56104533e4dc71cef2fde30e78720263b0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9DBE	19836 bytes

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