Malicious PDF — malware analysis report

Static analysis result for SHA-256 663905a4e91c83c2…

MALICIOUS

PDF

36.0 KB Created: 2021-07-04 13:42:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d49c4bebffa916a3dcb739a3bb07432f SHA-1: 1b4dab74ddcad30c168220526585dc91a06bafbf SHA-256: 663905a4e91c83c2b2dc91c259a0165284cc458b13cf70f3b890e2022c6185b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a malicious URL. The document body also contains this URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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/406889139/cheating-hacks-for-coin-master-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-out-of-the-cheater-cage-script_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/best-free-items-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/master-coins-free_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-generator-roblox-no-survey-pc_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-someones-computer-through-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-just-for-singing-up_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-stuff-in-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-roblox-for-robux-2021-without-human-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-the-catalog-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/games-of-roblox-for-free_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_off0000361c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x361C 23220 bytes
SHA-256: 7e15022b7d6a76f23bd87d0e7f7ca403929a594d941ed440187db13ea3cb11d9
font_01_sfnt_off00006a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A34 18332 bytes
SHA-256: 8bb7d0e3174467ad207b261381ef4eac10a5e073e0a89fef77a23780e0cfc6dd

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