Malicious PDF — malware analysis report

Static analysis result for SHA-256 850b83ccb101d8f6…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 02:04:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 50a25bb90d3a2ca8b2f2513f62a56945 SHA-1: bd9f5b291f9897a8dcabda59c216a0deffb5115f SHA-256: 850b83ccb101d8f6dd34ea99b58ddf036d971059c753377ea9282cb1d98e7ef5
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a lure related to free Robux and game hacks, which is a common social engineering tactic to trick users into clicking malicious links. The primary malicious URL identified is https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-game-hack, which likely serves as a redirector to a malicious payload or phishing page. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.xyz/app/431946152/how-do-you-get-free-robux-game-hack PDF link annotation
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-minecraft-skin-creator_GM479516143.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/body-roblox_GM431946152.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://agama.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-adopt-me-hacks-2021_GM431946152.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.

FilenameKindSourceSize
stream_003_off00004a8b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8B 24612 bytes
SHA-256: dd574e65149af2f848b3c2d389d7d5c63b0b414c544059f6d8b2be665bc69767
font_01_sfnt_off0000832c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x832C 18612 bytes
SHA-256: 37b0398febc23a1417b5642eaebf6c5e0b941c8fdaeae9a9e3ba89062b3e12f9

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