Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d2c915bc0fbabd…

MALICIOUS

PDF

43.3 KB Created: 2021-06-04 01:53:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9702ab55ce29c894f1f6a5622264a947 SHA-1: ae58e9f8ac3d15451b4d46053ece5386eaabf86f SHA-256: 52d2c915bc0fbabd0cf552c307701e262056b9bae458ec6d3e712ecabf0ccc31
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' or 'game hacks'. The primary malicious URL identified is https://netcdn.online/app/406889139/spin-coin-master-free-game-hack. The document's content and heuristics strongly suggest a phishing or scam attempt, likely intended to lead users to a site that may host further malware or engage in credential harvesting. No scripts were extracted, but the embedded links are the primary vector for malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/spin-coin-master-free-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/is-pokemon-go-free-on-nintendo-switch_GM1094591345.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/install-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
stream_004_off00004ee0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE0 24900 bytes
SHA-256: 625bfd25560754cdd14d2cc834113713efea0349b8c91ed3a676b915e1788245
font_01_sfnt_off00008802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8802 17884 bytes
SHA-256: 6361ede382a163d704ed6c8f102c2990305f9cba1a2540397fd15e2a8f655622

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