PDF malware analysis — malicious · f77d1aa93d051eea

MALICIOUS

PDF

42.6 KB Created: 2021-05-10 16:38:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05

MD5: 25c98133ea4025bb0ababf768df9f6d7 SHA-1: 42e7e15ef5721dee524e4fc8d997c7bc3801940a SHA-256: f77d1aa93d051eea74d92b5e695c1a34dcd8b3d3da0e8992b4b6ea6b9ccb7278

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 0.9933

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/406889139/coin-master-hack-android-root-game-hack PDF link annotation
- http://nikabio.com/images/roblox-verification_GM431946152.pdfIn PDF document text
- http://nikabio.com/images/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
- http://nikabio.com/images/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
- http://nikabio.com/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
- http://nikabio.com/images/free-money-links-coin-master_GM406889139.pdfIn PDF document text
- http://nikabio.com/images/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
- http://nikabio.com/images/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
- http://nikabio.com/images/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
- http://nikabio.com/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
- http://nikabio.com/images/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
- http://nikabio.com/images/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
- http://nikabio.com/images/minecraft-cheats-switch_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_003_off00003f87.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3F87	25384 bytes
SHA-256: `8ac51ec7d1d14a8fc9321f7207cd1c28c9233f366a795be5d990181e07cdc58d`
`font_01_sfnt_off00007a73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7A73	3400 bytes
SHA-256: `4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07`
`font_02_sfnt_off0000859d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x859D	17888 bytes
SHA-256: `a5e96d9585e0501da31a45c44832a76ab2659d3be1a27e30c9fef18018f5b43c`

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