Malicious PDF — malware analysis report

Static analysis result for SHA-256 4839daa7c2b824f2…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 11:32:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bb9d065da76f1819b37e48b7d7b053a1 SHA-1: fb84e4e89220581b3f40b615514601eb3480a9ff SHA-256: 4839daa7c2b824f24294fafa558118c291d67818ace13d5c67e53c2b4e0d645d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free spins' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-spins-a2z-help-game-hack, which is identified as a malicious redirector. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites.

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-a2z-help-game-hack In PDF document text
    • http://fkunismuh.org/perpustakaan//repository/earnrobux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/what-is-robloxhackexe_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/robux-generator-free-no-sruvey_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-epic-face-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-hack-roblox-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/legit-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-gampasses-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/20210-robux-free_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/robux-hack-zero_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-roblox-logo-t-shirt_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-hack-field-of-battle-roblox_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_off000030f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F1 22668 bytes
SHA-256: 84e0fd381908852c3b73c8cc62fb234a8e2fed48980a8b464842b6203a6a3802
font_01_sfnt_off00006396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6396 18464 bytes
SHA-256: 38371b38e202a061bb85b2c2f3babff414a9c8e1a23fd0033143b7789bcb9fac

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