Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c650bff9210ecc9…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 20:30:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b1b98e17378215ffce88c2ab8aa5bd73 SHA-1: fcc8b7d64280128269447ae66bddf3c799c2439e SHA-256: 6c650bff9210ecc9e20e42f0ac6a53854ebb03701f803e95f5158ab220a820fb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games like Coin Master and Roblox. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-spin-ml-link-game-hack, which is flagged as malicious. The document body and embedded artifacts suggest a lure for users seeking in-game advantages, leading them to potentially harmful sites.

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/coin-master-spin-ml-link-game-hack In PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/counter-blox-roblox-offensive-free-skins-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/roblox-big-paintball-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/today-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/how-to-make-a-costume-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/admin-roblox-free-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/thebuxian-get-roblox-ninja-animation-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-clothes-in-roblox-mobile_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-limiteds-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/command-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-critical-strike-deluxe-hacks_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/roblox-studio-free-download-for-windows_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_off00003329.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3329 22896 bytes
SHA-256: d5e8136a98f454e4be028185bceead752c5f0a6b7d1c00bf9c5b4f4dbdfcce9d
font_01_sfnt_off000066a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A0 18252 bytes
SHA-256: 6e36f73428881042ec5236fd241d8e8d1779ee7fa975823a1dde4452be0ebbd2

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