Malicious PDF — malware analysis report

Static analysis result for SHA-256 922c3c3e6890aaae…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 01:53:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b7aca1fb0fce25d3dd4906d784ab1621 SHA-1: af61024e6e1c20c839ce602b6da624264f12b2a1 SHA-256: 922c3c3e6890aaaeca7f877399bdebabcf62da836b93e719c9d0dfea95fc903b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically luring users with a 'free generator / game hack' theme. The document body and embedded URLs confirm this redirection to potentially malicious infrastructure. While no scripts were explicitly extracted, the nature of the lure and the redirector strongly suggest an attempt to deliver a secondary payload or phish for credentials.

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/431946152/www-rbxhut-com-game-hack In PDF document text
    • http://library.polita.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/how-to-play-any-paid-roblox-game-for-free_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-codes-for-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/pokemon-go-free-qr-code_GM1094591345.pdfIn PDF document text
    • http://library.polita.ac.id/repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/generator-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/me-hackearon-roblox_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-roblox-codes-october-2021_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/freemobile-360info-free-robux_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/no-scam-free-robux_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_off00002d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D4B 21720 bytes
SHA-256: e326b6ad3a36458185e5800bc164ca797fa07fa27733a367ac6cdcd3046e4d52
font_01_sfnt_off00005d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D42 19444 bytes
SHA-256: 60eab2e3afd0c7635d159dc58d933a25f8ff147bbc023de726d63f5eb8f1c975

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