PDF malware analysis — malicious · 303f2d9f0c900ec4

MALICIOUS

PDF

40.8 KB Created: 2021-04-26 20:04:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24

MD5: 36d4150a1de911e9d1aa45af0c8e50c7 SHA-1: 4db0b511e456f616c28514e57a6b53302c5595bf SHA-256: 303f2d9f0c900ec4a6b8afdfeb51d95b786d38901bb8c090b682b94eb81ce9cf

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://netcdn.xyz/app/431946152/free-card-number-roblox-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/free-card-number-roblox-game-hack PDF link annotation
- https://bioscience.kyst.com.tw/image/data/files/how-to-speedhack-roblox-without-cheat-engine.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/how-to-get-robux-without-getting-hacked.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/how-do-you-get-free-roblox-money.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/roblox-pet-simulator-hack-2021.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/how-hack-roblox-2021.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/how-to-hack-roblox-phantom-forces-aimbot.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/hacks-roblox-jailbreak-2021.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/robux-hack-that-isnt-fake.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/free-swag-roblox.pdfIn PDF document text
- https://bioscience.kyst.com.tw/image/data/files/cheats-for-bear-roblox.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_003_off00004291.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4291	24952 bytes
SHA-256: `19f205b8955b16b0fe61af24db6839c90912c0148216f1fcb70b6319413cfa01`
`font_01_sfnt_off00007c51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7C51	18748 bytes
SHA-256: `89a83c652fc22879b2ec3693dc30822ed87584837805b8509d9312825e676d61`

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