Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dec4fc9d170abee…

MALICIOUS

PDF

49.6 KB Created: 2021-06-11 05:49:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dbd4d34c22aab54bad040e65403ec4ae SHA-1: 76e9b7c8754936c7df7c519460e8e33790a6874f SHA-256: 7dec4fc9d170abee324f7b1f69e5bbf3b6770fff00dc90cef133b290190fdbe6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, leading to a "game hack" lure. The primary URL, https://netcdn.tw/app/431946152/how-to-insert-free-hats-on-roblox-game-hack, is likely part of a phishing or scam campaign designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a social engineering attack.

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.tw/app/431946152/how-to-insert-free-hats-on-roblox-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/complete-offers-for-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/tiktok-free-usernames_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-2021-iphone_GM406889139.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
font_00_sfnt_off000052d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52D9 28092 bytes
SHA-256: eefb06db42c533891076f42634c7c69ee5dfe824c91b172641604988f529312b
font_01_sfnt_off000094e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94E0 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECB 18444 bytes
SHA-256: 990e740dec865f810e4a271467d4c4cf990d902edc10cfc32f274fad1d31c105

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