Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b328f5765f1bfc…

MALICIOUS

PDF

48.3 KB Created: 2021-06-09 07:45:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3d48b3c93ab1005b644a46b1a7b1a12c SHA-1: 1cfe06593fe8fd8e411fc0193724f82e36046d7d SHA-256: 76b328f5765f1bfcddc8980b3408cbf4c18d10a31ed84b5b029a8ef0434139ea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency (Robux) or hacks to entice users. It contains multiple embedded links, including one pointing to a known malicious redirector infrastructure at `https://netcdn.tw/app/431946152/robux-stealer-hack-game-hack`. The document body, though heavily obfuscated, contains references to this URL and other similar-looking URLs, suggesting a phishing or scamming attempt. The presence of PDF-specific malicious redirector heuristics indicates a deliberate attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/robux-stealer-hack-game-hack In PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/how-to-get-25-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/guest-pants-roblox-free_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-roblox-exploits-2021-not-blocked-by-antivirus_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/how-to-get-free-hats-of-roblox-un-patch-able_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-candy-script-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pasca.unand.ac.id/repository/free-roblox-clothes-codes-2021_GM431946152.pdfIn PDF document text
    • https://krnl.rocksIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5494 29912 bytes
SHA-256: fa62cac1523309a8dad1d7101fca46c6ae12b2c8688cb70beec4c72271fa1268
font_01_sfnt_off000099d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99D5 18428 bytes
SHA-256: 866a9ff7844247952763291b66059ab03de8a5db77c62daeb19829d294a85c1b

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