Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f36d848e8d5f92…

MALICIOUS

PDF

43.1 KB Created: 2021-05-10 20:08:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5cd8bf881038a894faecad2ba91858d1 SHA-1: c5f2b9024a6996db38f5fa7a540c16348f58fd0d SHA-256: 56f36d848e8d5f929d786e1e621ff8bf5dc615e4e3e4fc8f4d5437e9efbeef92
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector infrastructure, specifically promoting 'free Robux generator' lures. The document body, though partially corrupted, also contains references to these lures and the malicious URL. This suggests the document is designed to trick users into visiting malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-to-get-free-robux-generator-game-hack In PDF document text
    • http://perpus.unik-kediri.ac.id/repository/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-free-spins-8-14-2021_GM406889139.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
stream_003_off00004a9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A9A 26088 bytes
SHA-256: cac31a9605b3a1b18d44dfbc7813ae16909a17f345a93df8315705f6700fd864
font_01_sfnt_off00008592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8592 18512 bytes
SHA-256: 02a745270f20da848e9c9bdefc0721d63769b74524dfc6c51231bae9bb0d5f7b

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