Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4c337239cae9a6…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 21:14:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 09f0d48c449ad35011ac9562d16d570a SHA-1: ba23b415b7f207bc6b10aa17b91544087bae8421 SHA-256: de4c337239cae9a6b6cad431c4ed4a2924fa7c37171374277dffbdc0fd1c168a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/free-coins-coin-master-spins-game-hack. This lure, combined with heuristics indicating a game hack or free generator theme, strongly suggests a phishing or scam attempt designed to lead users to potentially harmful content. The document body and embedded URLs reinforce this lure by referencing popular games and 'hacks'.

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-coins-coin-master-spins-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/www-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/comment-avoir-des-robux-gratuit-sur-pc-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-ios-2021_GM406889139.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_off00003143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3143 22996 bytes
SHA-256: 7d9f835a7e6811fb88b96d693389a336080afd60afb9faaae274970b9f558c76
font_01_sfnt_off000064e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 18176 bytes
SHA-256: 9c216cc6aa1e94c18ff26070eb99056dac407022fd31ef3f29cf2ac34e799f34

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