Malicious PDF — malware analysis report

Static analysis result for SHA-256 537de9d8a0ed9316…

MALICIOUS

PDF

34.1 KB Created: 2021-06-19 18:29:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 89283a30aa929869d4b7b190272a0ac1 SHA-1: 09ae7b9c17da454d80b59669528240471b42bf5b SHA-256: 537de9d8a0ed9316940500d2ff40d8ab007080a43752750bce50625a0dd7634d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appear to be free game hacks or Robux generators. The primary link, http://netcdn.co/app/431946152/free4now-info-free-robux-game-hack, is identified as a malicious redirector. The document body and embedded URLs reinforce this lure, suggesting a phishing or scam attempt to redirect users to potentially harmful sites. No scripts were extracted, but the PDF's structure and embedded URLs strongly indicate a malicious redirection campaign.

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.co/app/431946152/free4now-info-free-robux-game-hack In PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/site-17-hack-gui-roblox-script_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-get-a-weapon-on-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-put-cheat-codes-roblox-bubblegum_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/free-tiktok-fans-without-verification_GM835599320.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id//repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://e-library.akbid-purworejo.ac.id/repository/minecraft-free-download-2021_GM479516143.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_off00003000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3000 22004 bytes
SHA-256: 5cb48a8605f56ea52853f43ddcd4d67580b239e7a96393f1262499d46f16a403
font_01_sfnt_off0000607e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 18944 bytes
SHA-256: ff858e644e0b5656e96be9cbecba47ca6331fabe6bc730d5761e4eef41e98be2

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