Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ce7000b88cb738…

MALICIOUS

PDF

46.8 KB Created: 2021-05-13 18:34:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a866eefe14a0c69767843983e16ba894 SHA-1: d4fed54937c41b0f4427e84a7273f3a83e3cf86c SHA-256: 51ce7000b88cb738882e81cf3f9b93191816002596cb6ed6f5a2e3ec11f64cb1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' or 'free generators' for virtual currency. The primary lure URL is https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-without-paying-game-hack. This suggests a social engineering attack aimed at tricking users into visiting potentially harmful websites, likely for financial gain or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/how-do-you-get-free-robux-without-paying-game-hack In PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/facebook-coin-master_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://www.bandicam.comIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A65 25508 bytes
SHA-256: ce6f17e72d0946493d78a510a05cc634006d68ca7112bae57a41f5fbb48820fe
font_01_sfnt_off000085f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F8 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA7 19948 bytes
SHA-256: 5d1001e3ac77277796354ae1628373f4f4a3ba3fa344903a86c4555bafe1b783

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