PDF malware analysis — malicious · 266dc43e754368b6

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 07:10:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 34ee575d611522db104d6cfea977d031 SHA-1: 18775371006ab0148c94fd78769d571cc8840f84 SHA-256: 266dc43e754368b65b4d9f4f8885996d773ad36d988090feeecb78a1c8513a90

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9832

Heuristics 6

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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-generator-without-human-verification-game-hack PDF link annotation
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/roblox-trolling_GM431946152.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/rbx-roblox_GM431946152.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
- http://www.erealitysolutions.com/assets/dealercmslogin/js/ckfinder/userfiles/files/free-online-generator-for-coin-master_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_off0000550d.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x550D	26120 bytes
SHA-256: `1327e80772e2c56e5c84e90513b2f6884fe188fe28c88c76ce6952ff96aa2549`
`font_01_sfnt_off000091b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x91B6	19224 bytes
SHA-256: `40a7d61fbe05f3c06cc4b4f213318e5db23b17d00e7c534d307fd6e415ac6071`

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