Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b257ddb3b2d269…

MALICIOUS

PDF

36.9 KB Created: 2021-07-04 10:47:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 275b6a5a859ebd00d19b9aa0da7ba016 SHA-1: 3f828956bd51aa0bd11f1f021d3dbe162e278ff4 SHA-256: b0b257ddb3b2d26928ec62db3d00e955287c1b81710d51045742e604e05f5aed
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 0.9980

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-without-doing-anything-2021-game-hack PDF link annotation
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-microsoft-rewards_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-cheats-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-com-hack_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/pubg-uc-yatrma-sitesi_GM1330123889.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-how-to-get-anything-for-free-2021_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/pokemon-go-free-shiny_GM1094591345.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-free-pets_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-phantom-forces-noclip-hack_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-pokemon-brick-bronze-how-to-get-free-pokemon_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-mm2-hack-2021_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://pendapatan.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily-summary_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_002_off000033dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33DD 22944 bytes
SHA-256: bf6cc6218e42c19290e8816d137e744934dc2461c86c176fdf9d759c86718fb3
font_01_sfnt_off0000679f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679F 20220 bytes
SHA-256: 9b30e2885eb5843fedd856b186065d0d919d61cb100e3271a00bcc18fb5681c8

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