Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c73ce409c1dff80…

MALICIOUS

PDF

36.0 KB Created: 2021-07-05 15:38:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 92868aab6b1655879bac7051b96be4f9 SHA-1: 52f4ef711272d324eff57f642631f0ebce34d120 SHA-256: 1c73ce409c1dff80c3367eb993425bfef3816d723cd63a6f5e4998da112f84ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-spins-and-coins-hack-game-hack. This indicates a social engineering attack aimed at tricking users into visiting potentially harmful sites. No scripts were extracted from this sample.

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-free-spins-and-coins-hack-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/pubg-uc-hack-online_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/corn-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-youtube_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_off00003772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3772 22488 bytes
SHA-256: 82b77062b5e84b3a90e101099d89e6eb8f46780108bb48b6319e3d12d7ae9b38
font_01_sfnt_off00006959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6959 18520 bytes
SHA-256: c1559f7590648362f5cfdfce4209be73d9760d02d3452c31977188917b8b5890