Malicious PDF — malware analysis report

Static analysis result for SHA-256 45df65539983a275…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 15:57:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b40f83c40e809fd627b7f90dc120e645 SHA-1: ee4b52044c14a23630cc7f9b114c2c2817189a13 SHA-256: 45df65539983a275f919bed4370b0651eb962edd1e59ed951b646e6fdaf3c2ee
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and a call-to-action phrase, strongly suggesting a phishing or social engineering attempt. The primary URL, http://netcdn.tw/app/406889139/100-free-spins-for-coin-master-game-hack, likely serves as a lure to download a second-stage payload. While no scripts were explicitly extracted, the ML classifier's high confidence score and the presence of external URIs indicate malicious intent.

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/406889139/100-free-spins-for-coin-master-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-studio-scripts_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/notepad-hack-roblox-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-studio-free-app_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-roblox-and-get-meep-city-coins-fast_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-online_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-without-human_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/multiple-roblox-games-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-tool-free-download-no-survey-no-password_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/beyond-roblox-hack-wiki_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-codes-no-verification_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
stream_002_off00003155.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3155 22952 bytes
SHA-256: 454ffd3d77e6367ea2b76eddb4a09e813f0419fe55a6b393baf97792d115caf1
font_01_sfnt_off000064ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EC 18452 bytes
SHA-256: cbec87cca7f7cca850beed699eaca371d5fd18686c8cdb34b80e651b1aa3e733

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