Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d41729f1e5c6db…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 21:43:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a59eaae7387aabd5a7fbb473a99ec10c SHA-1: 18404c7c9998b1efa12c1fbc142d0ffb83ff4a12 SHA-256: 21d41729f1e5c6db13d823ef4e1444304ac8e93a173da938fad7ec2b7db09745
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/free-robux-accounts-game-hack PDF link annotation
    • http://daskrimti-jabar.web.id/library/repository/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/roblox-mafia-outfit-free_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-get-the-game-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/roblox-phantom-forces-hack-lua-downloa_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/my-roblox-account-got-hacked-ant_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/774-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/saving-pikachu-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/roblox-hack-tool-download-2021_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/pokemon-go-free-download-play-store_GM1094591345.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/hacks-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/free-griffin-code-roblox-adopt_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library//repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://daskrimti-jabar.web.id/library/repository/roblox-com-hack-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_002_off00003084.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3084 21840 bytes
SHA-256: dffb7b3d3ed518f6d10af650ff5b1af6d520c8edb835e767d76bad85891ac45d
font_01_sfnt_off000060c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C6 18820 bytes
SHA-256: 9247447a3c3765c463ad34d06656dabe45291e7d100ded84caf3f858f3985503

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