PDF malware analysis — malicious · cba9db5a6f5aa08b

MALICIOUS

PDF

41.2 KB Created: 2021-05-17 13:33:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22

MD5: ff97cd351f4d81da7811e8265b667e42 SHA-1: 3f92c4d646a533680ea3689282434b1f51789312 SHA-256: cba9db5a6f5aa08bdecf43bb073f40fe48d5c58af1d8d90ce82186e88f846edc

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and 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 6

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
Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/roblox-font-free-game-hack.
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/roblox-font-free-game-hack PDF link annotation
- https://loba.com.vn/public/upload/files/hack-roblox-players_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/roblox-people-girl_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/coin-game_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/freespinandcoin_GM406889139.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
- https://loba.com.vn/public/upload/files/rbx-land-free-robux_GM431946152.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
`font_00_sfnt_off00004731.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4731	24492 bytes
SHA-256: `93fd7fde5c6b878a19e4da79985c7392c169dea7e38ea137ed99fd4bfc01c33a`
`font_01_sfnt_off00007f46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7F46	18052 bytes
SHA-256: `fc18e09b38e7f37cf7e275b91981e3530b795bdeaada945aa3ce95e8818dbc1b`

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