PDF malware analysis — malicious · 3fbc8884414f52af

MALICIOUS

PDF

47.7 KB Created: 2021-05-12 03:37:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 9d78bde1180db32fed17788a16e85168 SHA-1: dd9c6c2c050927483a287ba6ad38a2bacd413344 SHA-256: 3fbc8884414f52af8e6be53e74039f0b2a4cf2b4674425b3583b410e48a3cf2d

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9013

Heuristics 4

PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE

PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
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/weird-roblox-game-hack PDF link annotation
- https://www.tw-storage.com.tw/upload/files/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/free-robux-working_GM431946152.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/robux-free-robux_GM431946152.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
- https://www.tw-storage.com.tw/upload/files/daily-free-spins-coin-master-2021_GM406889139.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_003_off00004a09.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A09	28656 bytes
SHA-256: `53e1ea82b8a262823f60d2b6536578b15feef51b9a3dfb8929363b1c9b0e1361`
`font_01_sfnt_off00008ae7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8AE7	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off000097f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x97F8	18276 bytes
SHA-256: `1b4cc20e0ac8438115b264510fe10e2d41ecb60e73830c90cadb3a3c1b276198`

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