Malicious PDF — malware analysis report

Static analysis result for SHA-256 23511af58c2d9a0c…

MALICIOUS

PDF

31.1 KB Created: 2021-07-19 18:49:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3fc9ab022a991f09b3418768b2e26723 SHA-1: 57856e2c1591ed0eef3b7caa755644fc006b6aaa SHA-256: 23511af58c2d9a0c201d19abee3d69d86be831573d7ce99c1dc38bef8e0b2bdb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically a lure for 'free Robux' and game hacks. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring the user to click a link that likely leads to credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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-real-game-hack In PDF document text
    • https://elearning.man1samarinda.sch.id/__statics/gudangsoal/files/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • https://elearning.man1samarinda.sch.id/__statics/gudangsoal/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • https://elearning.man1samarinda.sch.id/__statics/gudangsoal/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1samarinda.sch.id/__statics/gudangsoal/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1samarinda.sch.id/__statics/gudangsoal/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1samarinda.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man1samarinda.sch.id/__statics/gudangsoal/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://elearning.man1samarinda.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://elearning.man1samarinda.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man1samarinda.sch.id/__statics/gudangsoal/files/minecraft-pe-015-0-apk-free-download_GM479516143.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_off00002752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2752 21640 bytes
SHA-256: d21fd6d2eb74f25c7b9008486dabe1d280f8725732f3dc4ec7c74d6ed74f3749
font_01_sfnt_off000056cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56CC 18504 bytes
SHA-256: 355fd3b799690fa6ab6c8cf295844118158e01fcbf12aab8e6bde9acc37c3376

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