Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9c2143f69483c2…

MALICIOUS

PDF

51.3 KB Created: 2021-06-09 16:48:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cdfea78b593a9b3a2afa8deec058503a SHA-1: 0c53d49bb36e0d3cc1f467c98288f9bf2bba2b1e SHA-256: 9b9c2143f69483c26b0b588e128664ae31a0e1ccd919d0a5767a95296a97ecfc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with themes like "game hacks" and "free generators". The primary malicious URL identified is https://netcdn.tw/app/431946152/how-ro-hack-roblox-account-game-hack. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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-ro-hack-roblox-account-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/wurst-commands_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/youtube-how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/top-kek-v4-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-scpt-site-61-admin-cheat_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000517d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517D 26496 bytes
SHA-256: af47063df2fdc54d4c9af879eee30d3ffeacc757fc2a0972abb76218b0c69e39
font_01_sfnt_off00008d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D88 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9732 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA444 18588 bytes
SHA-256: aeb23a038374e7654f63b6421979d5339e645d634e22de5cff94936f044850b7

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