Malicious PDF — malware analysis report

Static analysis result for SHA-256 911f5ad0a8ccb91d…

MALICIOUS

PDF

44.0 KB Created: 2021-06-09 04:29:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a1cab1d1fe6aca0ed8ad0452c5bf0eb4 SHA-1: 24e785fa54c853033511ed10f3d4bc2b59945909 SHA-256: 911f5ad0a8ccb91daf9bbeccfd956d90d0522092d673573953165bb05ea9b7f3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9865

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.tw/app/431946152/do-do-you-get-robux-for-free-game-hack PDF link annotation
    • https://opac.itp.ac.id/repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/25-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/dl-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-earn_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/collect-robux_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_004_off00004fea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEA 24712 bytes
SHA-256: 861ea2543cfa4bf9361a53fa4f25203feeee0fc3ac70a00ed3719ee04d59088e
font_01_sfnt_off0000889b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889B 18448 bytes
SHA-256: c8158c8ee305c88d5660b23e393f41cda99e0478a072287856b04cd21d86b58d

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