PDF malware analysis — malicious · bdab08d4d502ecd0

MALICIOUS

PDF

52.3 KB Created: 2021-06-08 12:48:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 5a17c00661eb1ba3faf87d0716a64dc9 SHA-1: 7ee82f0ae87ababd24b28646d7753c2890ff8270 SHA-256: bdab08d4d502ecd0a47351859ea665a4734dc24ad8f541b75eee37cce2118cde

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure, aiming to trick the user into clicking a link. The primary external URI points to a resource on netcdn.tw, which is likely a landing page for a malicious download or exploit. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9464

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-username-change-free-game-hack PDF link annotation
- https://www.tiancom.com.tw/upload/files/pokemon-go-x-free-download_GM1094591345.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/free-robux-now_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/coin-master-20-free-spins-link-2021_GM406889139.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/free-robux-app-real_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/roblox-ftw_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/roblox-anime-fighting-simulator-hack_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/how-to-download-minecraft-hacks_GM479516143.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_off000050d6.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x50D6	31484 bytes
SHA-256: `58100b4d32489ae24d55ae5acbb120b429231bf9208386d5a9fd225377912e99`
`font_01_sfnt_off00009785.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9785	6768 bytes
SHA-256: `fa93de321190668b294ff46149e4b98ac349b4fd022dcee9ecd964f7f59f3f9a`
`font_02_sfnt_off0000a7c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA7C4	19076 bytes
SHA-256: `f29e04222e97e4e21b82a8982b677645499fce2796f2bf13473ec9975b1cd6e5`

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