Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cdbbcaeffa7760…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 05:20:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 37bacbce94ff61415ecbdb1d031efcaa SHA-1: 1cfac3513158832458e10bd25eda7aae992c00f3 SHA-256: 53cdbbcaeffa77602ab14d8532e1fb7add551e0525c35738f1d0c4728437ae6b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The ML classifier strongly flagged this PDF as malicious. The document body and heuristics indicate a social engineering tactic to trick users into visiting a potentially harmful URL, likely for further malware delivery or credential harvesting.

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.tw/app/431946152/bux-gg-robux-free-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-speed-hack-download-jailbreak_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/descargar-hack-unu-para-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-free-model-roillercoaster_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-gift-card-pins_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-flyable-pets-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-links-to-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_off00002e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E89 22168 bytes
SHA-256: 4038951dc2a02c410f7455438237545e66a4ead346b191f726a72e04dd3d8821
font_01_sfnt_off00005fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDF 18716 bytes
SHA-256: ceb96bcce7201d9a7ae6d76b35bd05639ee9f0a30dad638d5074f4338692034b

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