PDF malware analysis — malicious · 5b8f167bada17a87

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 15:42:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01

MD5: 200464952367051a045a8bbcd64089d6 SHA-1: 90f532eb8fbb7355d758f092ad70cee5310c770d SHA-256: 5b8f167bada17a8784f4bc93bb5d4672ce112507e146bf0f89b092ccaa0eec94

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 0.9796

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/free-robux-quiz-game-hack PDF link annotation
- https://www.jcn.co.uk/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/robux-robux_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/minecraft-svg-free_GM479516143.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
- https://www.jcn.co.uk/uploads/files/files/free-online-minecraft-server_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
`font_00_sfnt_off00005124.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5124	27004 bytes
SHA-256: `deebc3da9cbd12bf303a63c8920e0dd8f6b46a9e7c859fa7ddf54a2e9937245d`
`font_01_sfnt_off00008f49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F49	2852 bytes
SHA-256: `e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f`
`font_02_sfnt_off0000990b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x990B	18376 bytes
SHA-256: `b52519a3f27e6183245bec6d77d3cda93d913202ea7147b0d6d9048d316cd5fc`

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