Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef4529f31b7d653…

MALICIOUS

PDF

34.2 KB Created: 2021-06-17 19:31:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 67a0f44484084e06549430d22f1ba6f9 SHA-1: 6699eb1e11f89c79d1e1c0db3e4170ce4b134d8b SHA-256: fef4529f31b7d653c416f45bc7dd4f59f6550b57cae815b9ada60a41e075cf5b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector. The primary lure appears to be related to game hacks and free generators for popular games like Roblox and Coin Master. The document body explicitly contains the URL http://netcdn.co/app/431946152/how-to-cheat-on-roblox-guess-character-game-hack, which is flagged as a malicious redirector. This suggests the document's purpose is to drive traffic 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/how-to-cheat-on-roblox-guess-character-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-cloth-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-easy-for-kids-fornoobs_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/hacks-de-velocidad-para-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-get-r-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-games-on-ipad_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_off00002ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED9 22316 bytes
SHA-256: def5b2077839bf5676c1bd4e2bbe81a990e692a38a36e6f1cc621bd6b160b81a
font_01_sfnt_off0000606f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x606F 19060 bytes
SHA-256: 92082ae570d85f6f441673802dc3f579eea8c9a7bcec3df115f6d3f60d349da5

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