PDF malware analysis — malicious · 9f9dc31ecf5dc607

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 15:08:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01

MD5: 0e520e4f050f872536bc05fff2dca480 SHA-1: 309cab043d471ee4307ca5d4c2dd450498a0c3ab SHA-256: 9f9dc31ecf5dc6075cc1fa3c0ca32b5e1e2e0bd02b4dea552f846d7705fa41bb

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9864

Heuristics 5

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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.online/app/431946152/robux-com-free-robux-game-hack PDF link annotation
- https://www.jcn.co.uk/uploads/files/files/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-coins-amp_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_004_off00005164.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5164	27716 bytes
SHA-256: `8709ea8eb17d5fc23551f34c30102f20c9d481fe2401d740beda027549b9942a`
`font_01_sfnt_off0000907b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x907B	18276 bytes
SHA-256: `15a0db03ecad41b32ad15729058012b5ee1d917146ec7af3e780186d41394abc`

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