PDF malware analysis — malicious · a8851c3ff65dd0f3

MALICIOUS

PDF

47.6 KB Created: 2021-06-03 16:58:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 06d2bc5d300fae831aefe1424a1711f2 SHA-1: 0907483e45bd93d46196a109d1d44fe8ebdb0d09 SHA-256: a8851c3ff65dd0f305e03b2d9fe3438f2ada3c7559c4cbe58ef1dc2fc56198fa

122 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to deceive users into interacting with a malicious link. The link, 'https://netcdn.online/app/431946152/vip-roblox-free-game-hack', redirects to a game hack generator, which is a common pretext for delivering malware. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/vip-roblox-free-game-hack PDF link annotation
- https://www.jcn.co.uk/uploads/files/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-hacks_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-robux-legit_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-hax_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-money-links-coin-master_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/minecraft-free-trial_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-links-to-coin-master_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-minecraft-realm-codes_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_off00005099.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5099	25396 bytes
SHA-256: `aaf5804a3b78c228df3f790a11ca8a2155387220f89d09e4d36a57bf6173b5d2`
`font_01_sfnt_off00008bb9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8BB9	3400 bytes
SHA-256: `4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07`
`font_02_sfnt_off000096e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x96E3	18380 bytes
SHA-256: `36df52832172213c9c2be9107f6005f18732e6546fa2c0231abd2cacfa04afea`

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