Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98df4fc82dbeefb…

MALICIOUS

PDF

41.6 KB Created: 2021-05-14 18:00:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 23491502dfce00022e066d9cd6cbc523 SHA-1: ed0fb06f2376ff006da71d85f683a368afc96fc0 SHA-256: b98df4fc82dbeefb3f08977b718651f88819f57479007a330ad4a43d1d5b7897
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 0.9971

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/rblx-city-free-robux-game-hack PDF link annotation
    • https://mbbs.hr/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/wurst-18_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/play-games-for-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/app-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-roblox_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
font_00_sfnt_off00004566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4566 25716 bytes
SHA-256: aed01fbb825789248a324ff7fe7102ca0a6bf2890d516ddbe8f4302188d29224
font_01_sfnt_off00007f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F76 18492 bytes
SHA-256: 8c36c54b235ee774b4288e3a660071bec0b4f54d4ae0ca28de0be66b92090129

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