Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5737386a690d33b…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 13:33:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e773399291ed754dfd76add57df0ccf7 SHA-1: 83b7c39088866314516cf4b50bd3d0a1fcacfa01 SHA-256: c5737386a690d33bf11d449d31ef007f153b1a7585836cb1cc27bd3af741d114
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks'. The primary URL identified is https://netcdn.online/app/406889139/master-hack-coin-game-hack, which is likely used to deliver a secondary payload. The document body, though heavily obfuscated, contains references to game hacks and URLs, reinforcing the lure.

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/406889139/master-hack-coin-game-hack In PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/free-robux-co_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/i-want-robux_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://belajar.kurman1kotasemarang.com/__statics/gudangsoal/files/minecraft-free-download-windows_GM479516143.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_004_off000054d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54D5 25444 bytes
SHA-256: 41816ac221f2be765a424a3b6ad024720fc2f8290d3046cf5a04741eb0f50d07
font_01_sfnt_off00008f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7A 17716 bytes
SHA-256: 458e034195b9d21dc4a16e006206fa5889a20d0bfe7da041b4dcadf36e5a6633

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