Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0539bb189b8024…

MALICIOUS

PDF

34.6 KB Created: 2021-06-20 01:13:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c688ccd5b8e566bbc87aa1758f31ad38 SHA-1: dda3187a0e0f63ad3be05596d5ed4220645a9f13 SHA-256: ef0539bb189b802446b865132554391aa79f28b2e681a0c57d3a4248fa39ea30
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to malicious redirectors, specifically advertising 'free Robux' or 'game hacks' to lure victims. The primary malicious URL identified is http://netcdn.co/app/431946152/free-robux-june-game-hack. The document's content and heuristics strongly suggest a phishing or scam attempt designed to trick users into visiting malicious sites.

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-june-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-mad-city-bypass-anti-cheat-script_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/ebay-free-acount-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-2021-cheat-engine_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/como-hackear-gente-en-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-2021-today_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_off00003172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3172 22156 bytes
SHA-256: 9168e048d0bee67a340e42970908611f6aea162643aa0ffced5decef5037fc8e
font_01_sfnt_off000062b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B3 18880 bytes
SHA-256: 7d917a9d394f9f2fa36f5f0e79e0f7190c58f2330257d8d67cf00fd072f55755

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