Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa3ecb45920c3f7…

MALICIOUS

PDF

35.4 KB Created: 2021-06-19 12:42:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 458192caf1e470c99a8ba7ca0749fca3 SHA-1: c8dda7c7ee11d963f0f15c5a1c1ed8acce573ab7 SHA-256: efa3ecb45920c3f76781e3e0d12fed2e290fea3589b9edc644fc8ea1edbc3b8e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, masquerading as game hacks or generators. The primary lure URL is http://netcdn.co/app/431946152/robux-free-no-human-verification-2021-game-hack. This behavior is indicative of a phishing or scam attempt designed to lead users to potentially harmful websites.

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/robux-free-no-human-verification-2021-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-account-info_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-be-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/to-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-roblox-speed-hacks-cheat-engine_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/pubg-uc_GM1330123889.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/can-i-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-earn-free-spin-in-coin-master_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
font_00_sfnt_off00002fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEA 22916 bytes
SHA-256: 63e8dc5ac1fc4550bd36c600dff6fdc0a76e30a2ca304f6f201c1bea38a9b5c4
font_01_sfnt_off00006347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6347 19736 bytes
SHA-256: 4fd290dc37c9a492e41b857c9710dbe7bf2b66a3c096048a9d23d725958ae435