PDF malware analysis — malicious · 1c3e48404efc0305

MALICIOUS

PDF

46.3 KB Created: 2021-06-11 03:59:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)

MD5: dc6d5bdc582795601dfc416fba9db9ff SHA-1: 5510aeb7f7fbdef59393367b22e50cb7786997e2 SHA-256: 1c3e48404efc03055ee10995ea8275baf09e47c8f550a763d434be2e62d9ac34

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains invisible links that redirect to CAPTCHA-themed websites, a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of external URLs further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9832

Heuristics 4

Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE

PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
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/free-jordan-shirt-roblox-game-hack
- http://elib-s2.ubl.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdf
- http://elib-s2.ubl.ac.id/repository/free-roblox-code-generator-no-human-verification_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdf
- http://elib-s2.ubl.ac.id/repository/download-roblox-for-free-and-let-me-play_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/free-robux-easy_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/roblox-sign-in-free_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/reach-hacks-roblox_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/free-robux-hack-glitch_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/cheat-pekalongan-roblox_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/roblox-flood-escape-to-how-to-get-fly-hacks_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/roblox-case-clicker-cheats_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/free-robux-with-recapcha_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdf
- http://elib-s2.ubl.ac.id/repository/free-custom-script-runner-roblox_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdf
- http://elib-s2.ubl.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/clover-online-roblox-gui-hack_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdf
- http://elib-s2.ubl.ac.id/repository/free-robux-2021_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_off00005266.bin` `9be0a5706fcdc6999d78c5563666d00f7d68f3202fc63f0c2b1d2b7f0c47a7b2`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5266	26716 bytes
`font_01_sfnt_off000090c8.bin` `4bc5e01ca0e9b0305b5f8b55ab7fbc2862d7bd8b98b9a31781e7507f64ec1794`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x90C8	18904 bytes

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