Malicious PDF — malware analysis report

Static analysis result for SHA-256 634d0ea2015df50d…

MALICIOUS

PDF

47.8 KB Created: 2021-05-11 00:36:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4fcbf48543682e0f53c7ef9a4ce217dd SHA-1: 1a9cc3c346314de57c7f657495c4b1cb37b8c146 SHA-256: 634d0ea2015df50d024a3e59c3ab5e77569f08b0e19a6bab6abbf2e6039beda2
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, directing users to a URL that likely serves as a redirector for malicious content. The document's content and the presence of external links suggest an attempt to trick the user into executing a payload, possibly by exploiting vulnerabilities within the PDF reader. No scripts were extracted, but the overall pattern indicates a downloader or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-to-earn-robux-for-free-2021-game-hack PDF link annotation
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-hack-version-apk-download_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.

FilenameKindSourceSize
stream_003_off0000485a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x485A 34156 bytes
SHA-256: 717935c02c0c65caea04be24b9dcc5a26452a03c7caadf9ebf201f5aefec6e10
font_01_sfnt_off0000972f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x972F 18808 bytes
SHA-256: 177d88bc60daff4309aceb58336b2ba1d1983158bcd2aa353c0aa46f075a8142

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