Malicious PDF — malware analysis report

Static analysis result for SHA-256 4622bd83229cd40c…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 09:33:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3c9c1a214299cc55ef0b6293a68a4e57 SHA-1: dcab044008b02f01717fc0b8bc0ef574e7f0598e SHA-256: 4622bd83229cd40cf8d0c237ccd99bbb14739bd3825516f8d4be7a96cdb791d2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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 http://netcdn.tw/app/431946152/free-robux-real-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/como-tener-hacker-en-el-hospital-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-22k-from-groups_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/flamethrower-gun-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-hack-not-fake_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/claimfree-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-cheat-engine-download-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/batu-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-unlimited-robux-and-tix_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-catalog-items_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/earn-5-robux-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/freerubux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-gui-hack-mac_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_off00002e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E67 22880 bytes
SHA-256: af37c458a74b51d3f44eb784d1c4570d397d261175288cb6a21fe000a8436e64
font_01_sfnt_off000060dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DD 18788 bytes
SHA-256: 4bc1fb5241f7d1727492069c2276e888dd2add0fc79522b75a602c51baadbe08

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