Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff578cc23b96093…

MALICIOUS

PDF

35.7 KB Created: 2021-06-18 02:07:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5e99b83b0977ecadb1a0a9a9303cffc2 SHA-1: e936e086f2e00a4b11e16a37f2d6658db52ecf6b SHA-256: eff578cc23b960933e50ed82ae6f5bc2a551e0a19d06a33de2b43e30de0b2f2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' and game hacks. The primary lure URL is http://netcdn.co/app/431946152/free-robux-and-obc-generator-game-hack. This suggests a social engineering attack aimed at tricking users into visiting potentially harmful websites. No scripts were extracted, but the embedded URLs and the nature of the lure strongly indicate a phishing or scam attempt.

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.co/app/431946152/free-robux-and-obc-generator-game-hack In PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/roblox-sex-script-cheat-engine_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/free-robux-rixty_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/roblox-booga-booga-instant-kill-hack_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/how-to-hack-reason-2-die-on-roblox_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/new-2021-roblox-exploit-hack-superskidv1_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/asshurt-roblox-exploit-free_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://e-learning.man2-oki.sch.id/__statics/gudangsoal/files/roblox-free-bag_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_off000033ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33AE 22932 bytes
SHA-256: 943fe2610e53f7cd7c927c3f60cc14842fa246fe6769caadeb5e6f6e0a65cb2e
font_01_sfnt_off0000670c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x670C 18808 bytes
SHA-256: e8de445d4954df0d50296344f372fc869ee3dcbf40031e2186d2cb5d28829a70

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