Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c498f56efa298dd…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 13:19:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5adfa84978176f917f8571f9ee013d3b SHA-1: 30d847cb16c059462da529e7cdd157cd11a30ca6 SHA-256: 9c498f56efa298ddcc863de3fc7def97b6e092e8407eba28f86cc067155e260e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirectors, specifically advertising 'free generators' and 'game hacks'. The primary malicious URL identified is http://netcdn.tw/app/431946152/free-robux-com-2021-game-hack, which is presented as a lure within the document body. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful content.

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/431946152/free-robux-com-2021-game-hack In PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/how-to-download-tiktok-free_GM835599320.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/static-moonactive-net-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/pokemon-go-free-pokeballs-no-human-verification_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/comment-hack-roblox-pour-avoir-des-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/robux-games_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/roblox-system_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
font_00_sfnt_off00003156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3156 22096 bytes
SHA-256: 4f83cffb667fabee79c591f9743b392b20568d52cd01ff8a8b84b19238dc81e9
font_01_sfnt_off0000624f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624F 19380 bytes
SHA-256: e4a3050f3e501d111e2505792e6fe17b213487e8f387ded0c09bd9d126917491

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