Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0618d17af6ac53…

MALICIOUS

PDF

35.0 KB Created: 2021-07-07 22:20:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 21719981f89456697fbfdcba734b2c5e SHA-1: 09461cb7df8233ab6702dafa05260e4d489cb543 SHA-256: 2a0618d17af6ac534a138afb10a0853527455936e70523bd18521ad6ffed37bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'hacks' for popular games. The primary lure appears to be a 'free spin and win coin master game hack'. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive users to potentially malicious websites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spin-and-win-coin-master-game-hack In PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/download-roblox-windows-7-free_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/how-to-get-free-roblox-limiteds_GM431946152.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stimaimmi.ac.id/perpustakaan/repository/free-robux-no-human-verification_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_off00003159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3159 23100 bytes
SHA-256: ce6a18d766bcb8f39b1e987036f62d90c0c17a5e7a69ef02e128bdaf08420d1e
font_01_sfnt_off00006522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6522 18548 bytes
SHA-256: b9db317eaf3db36a6e52b5dfe98c7fc2c97b5ad438dfc0dcb37cbdfbcff15dbf

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