Malicious PDF — malware analysis report

Static analysis result for SHA-256 610fdfb4c1f865b1…

MALICIOUS

PDF

42.8 KB Created: 2021-05-12 14:34:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5cb171714a727efbec8d9333a2e09e1a SHA-1: 04b26d81f995e11a32ff1e4a3008d3d97f3b1b46 SHA-256: 610fdfb4c1f865b160df17357c23f19b5e1d4e3edb7a8c5bc5476b500d973e48
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent external URI pointing to a download site, likely for a malicious payload. The document body, though partially corrupted, suggests a lure related to free in-game items, consistent with the 'SE_CALLBACK_LURE' heuristic. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.xyz/app/431946152/free-robux-ad-game-hack
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-roblox-gift-cards_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan//repository/free-coins-on-coin-master-2021_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spins-whatsapp-link_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan//repository/actual-free-robux_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan/repository/free-24-7-minecraft-server_GM479516143.pdf
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spin-link-app_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan//repository/hack-version-coin-master-apk_GM406889139.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/cheats-coin-master-free-spins-and-news_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-2021-app-download_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan/repository/free-minecraft-skin-creator_GM479516143.pdf
    • http://fkunismuh.org/perpustakaan//repository/coin-master-hack-apk-link_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/real-free-robux-generator_GM431946152.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-robux-no-verification_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan/repository/free-shirt-templates-roblox_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan//repository/www-roblox-com-free-robux_GM431946152.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-generator_GM406889139.pdf
    • https://www.roblox.co
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c5b.bin
950b829d1ff7ec52fa71302392b39aea5c833097a940f68bf8bde745ccd09741		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C5B 24704 bytes
font_01_sfnt_off00008540.bin
8548f8eac6602b4da1df91b5e613954ee993c39611fc0c0834e4b9af2cb2062a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8540 18188 bytes

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