PDF malware analysis — malicious · a8186c3f1b2dad41

MALICIOUS

PDF

41.6 KB Created: 2021-05-18 05:03:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04

MD5: 725a0e38d2826ed9ae0b08b6b2ee2f38 SHA-1: a445bd12c5576c5e358247299d650a71083c2a08 SHA-256: a8186c3f1b2dad419680bcad430984205f4fbbdcabc55d46906cc4f3d625c30d

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9971

Heuristics 5

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.
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.xyz/app/431946152/free-robux-scam-game-hack PDF link annotation
- https://www.simplenepaltravel.com/userfiles/files/grabpoints-robux_GM431946152.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/real-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/free-roblox-items-codes_GM431946152.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
- https://www.simplenepaltravel.com/userfiles/files/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off000047dd.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x47DD	24388 bytes
SHA-256: `dbe86f6b08957dfbf6cfdd4e4a64fd3d433d26cb5e5a663a0e856b96c1515272`
`font_01_sfnt_off00007fb7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7FB7	18500 bytes
SHA-256: `24c52a02bd601b0a5cf869202747d5c16280e540771a7d3b3f68f33a5cbf68e3`

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