Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e8dce367b21a32…

MALICIOUS

PDF

48.7 KB Created: 2021-06-03 09:00:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 98f67cfe56fe80a3d6eb2ee903a5ec44 SHA-1: cbfcc775aa867c85943ac9dcf4bafd693e2c65fa SHA-256: 21e8dce367b21a324eecac8ba85a11caa5371882ab973848d7231c13a034958a
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 "free generator / game hack" lures. The primary malicious URL identified is https://netcdn.online/app/406889139/free-coin-master-coins-and-spins-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at tricking users into visiting potentially harmful sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/406889139/free-coin-master-coins-and-spins-game-hack In PDF document text
    • https://perpustakaan.stami.ac.id//repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/www-coin-master-hack-tk_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-working_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/mcpe-download_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/make-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51AF 27832 bytes
SHA-256: d5d7502f9df9a13d8ef28474aa823a66818629b4be80fbec7fd675510e329069
font_01_sfnt_off000092cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92CF 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C81 18060 bytes
SHA-256: 11bd500b33c169b65e53ecddb4cd7ac7428d9a9bdc32d60ba78f45c9260aee9d

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