Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f599fbefd6f2921…

MALICIOUS

PDF

47.8 KB Created: 2021-06-04 03:45:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0fac93f635ab0d18fc177ebca0bfeb7f SHA-1: 5d8fb6fefef5031ac6c8546fd55e4422488c62c6 SHA-256: 4f599fbefd6f29213f7574579b2c1980c0ea39a0b510c4eb858a19b12a93138d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that claim to offer game hacks and cheats, such as for Roblox and Coin Master. These links are identified as malicious redirectors, indicating a likely attempt to distribute malware or lead users to phishing sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/431946152/roblox-mobile-hack-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B8 26208 bytes
SHA-256: cae0921c89c94f8483cac12884d50b249bf4a559d255e950684089f65d6d49ca
font_01_sfnt_off00008d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7E 2912 bytes
SHA-256: fa76cc2dab30b56d5305de71ce949b6adffd6580af2f26905a33966a3200adbb
font_02_sfnt_off0000977a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x977A 18500 bytes
SHA-256: e5e44b7d88d65c0aa39187413bdce35fa7eb26b841b7c8af9c826d312b99eefc

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