PDF malware analysis — malicious · ead22870bcc12119

MALICIOUS

PDF

41.7 KB Created: 2021-04-23 19:50:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23

MD5: 4b87e5fa552b14667f5fa0becc913767 SHA-1: 9e23dfdb5d1d7b6ffb9e375dd7544fadf1947d37 SHA-256: ead22870bcc12119d78c7de586a88150cd5d93dcd01f54eeedfb86e5d541d3ed

122 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. 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 0.9941

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.
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://netsecure.top/app/431946152/free-robux-online-no-verification-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://netsecure.top/app/431946152/free-robux-online-no-verification-game-hack PDF link annotation
- https://bioscience.kyst.com.tw/image/data/files/rosie-hacks-caillous-roblox-account.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/cheat-roblox-granny.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-cards.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/free-roblox-animations.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/black-tshirt-roblox-free.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/2021-free-robux-windows-8.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/roblox-free-net.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/free-400-robux-code.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/cheat-engine-roblox-lumber-tycoon-2-table.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/gift-cards-for-roblox-free.pdfIn PDF document text
- https://freerobux.cyouIn 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_003_off00004348.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4348	27828 bytes
SHA-256: `4f65304b020a0db0ac5c3ec86248977dc5df3652c1d4e099f5db393523395326`
`font_01_sfnt_off0000800c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x800C	18676 bytes
SHA-256: `224155d05dbf4849d60f0e4e0188872d17362d00b72a6881dffedf0a97e052d0`

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