PDF malware analysis — malicious · 3872d1fa84f38500

MALICIOUS

PDF

47.7 KB Created: 2021-06-10 21:32:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: ffa364332791720ebd0aa7a7d4b082e1 SHA-1: c8d2301327d63049c5be3247011dce6f17c0e01a SHA-256: 3872d1fa84f3850043e6b2f2ae24c28535cc61e058677e88ea2b03f37ac286cd

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document presents a fake CAPTCHA or verification prompt to lure the user into clicking a link, which is a common social engineering tactic. The embedded URL, https://netcdn.tw/app/431946152/roblox-free-games-only-game-hack, likely leads to a malicious download or further compromise. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

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/roblox-free-games-only-game-hack PDF link annotation
- https://radiocaxias.com.br/portal/imagens/files/roblox-snowman-package-free_GM431946152.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/coin-master-spins_GM406889139.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/free-robux-co_GM431946152.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/free-robux-picture_GM431946152.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/free-robux-straight-away_GM431946152.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://radiocaxias.com.br/portal/imagens/files/but-link-says-free-robux_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_004_off00005200.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5200	26360 bytes
SHA-256: `2fa698a78c076b792d8bbd87410c53ceb95d231e29f1ade21251da77238c95e1`
`font_01_sfnt_off00008ca2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8CA2	2880 bytes
SHA-256: `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`
`font_02_sfnt_off0000968c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x968C	18616 bytes
SHA-256: `05e6adc564d1879488de4bdd714566168f207c2a3b091e1135f9f3b995f6bcae`

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