Malicious PDF — malware analysis report

Static analysis result for SHA-256 efea4b1f8372efa3…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 10:47:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f1b3e53ecb34d66598ec37ae126c714b SHA-1: 0ba138d8f6d89588d7317edf57c0858810f393b9 SHA-256: efea4b1f8372efa3691ce06bf71015ae1828821fa59f60864dad1ecd487d2d35
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free Robux" or "game hacks" to lure users. The primary redirector URL is https://netcdn.online/app/431946152/free-robux-without-any-verification-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector designed to deliver a second-stage payload or engage in a scam. The document body, though partially corrupted, contains similar lure text and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.online/app/431946152/free-robux-without-any-verification-game-hack In PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-coin_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-download_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-no-verification-2021-ios_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_off00004fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE1 24460 bytes
SHA-256: 190b26b9c61cf4ccd20cb15ac6f86269fc903b11b76a8323d6234aef0630b127
font_01_sfnt_off000086e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E3 19144 bytes
SHA-256: f37955fcb4845292a10cf385cf7825d095aa25907e4328d2f78dbaed4e94b6f7

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