Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5232e9cfc5b1eb…

MALICIOUS

PDF

46.0 KB Created: 2021-06-09 03:52:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1cf44772d968f3dfc9b094bd14755f92 SHA-1: 0df4cc3a2cc8eaf0ab5e088e65ba0cb96b99a1eb SHA-256: 7b5232e9cfc5b1eb5905de21c6b63aad935520c498844f48397ecf781d7ec827
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body, though partially corrupted, includes a URL that aligns with this finding. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/how-to-get-free-stuff-in-roblox-catalog-2021-game-hack In PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-generator-no-download-no-survey-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/without-pokemon-go-free-account-2021_GM1094591345.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/wurst-18_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-spins-coin-master-hack-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
stream_004_off000054ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54EF 24916 bytes
SHA-256: 4d999bfd444a5697754c06828c042347ed71cbc43425c11cb00f91a17f8d336b
font_01_sfnt_off00008e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E06 19272 bytes
SHA-256: de6272a10cba5b6b3dc3c7195ecedd3ee2a4753cc5a4e94826cdaa293b1afd6d

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