Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a58db867e0e9be…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 14:43:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 899a8d3c2c1862528b4aa5390f28996c SHA-1: 0218d72902844c16378249f817e45fdec8d3935e SHA-256: 79a58db867e0e9be866a1f19bc568d8618de4923300a5547e5b0ba75c35cb3bf
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a lure for a 'free generator / game hack' which redirects to a URL designed to entice users into downloading further content. The presence of an AcroForm button with an action trigger and the ML classifier flagging the PDF as malicious strongly indicate malicious intent. The embedded URL is the primary indicator of a potential download or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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/bux-life-free-robux-game-hack PDF link annotation
    • http://library.stieyapan.ac.id//repository/pokemon-go-basic-vs-premium_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pokemon-go-free-key_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-obby-gives-free-robux-with-game-link_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-earn-robux-fast_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_off00002ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF4 22632 bytes
SHA-256: 199ce151a302318d9aa161d39a38e6d21c3859f6640dc169b5ad10ba82548f8f
font_01_sfnt_off00006277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6277 18836 bytes
SHA-256: 7f12d751da4e96ccad4d997d7560df235183c1e20666712b69b1e712c003bbe9

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