Malicious PDF — malware analysis report

Static analysis result for SHA-256 52afa488eef54551…

MALICIOUS

PDF

44.9 KB Created: 2021-05-14 05:35:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7f906d13d05dd373e67e052bd57eb4bc SHA-1: c0df2285ed31fc918481c8fec945bf8fd89611bd SHA-256: 52afa488eef5455111f011f43e4f0505e87452effea87a02d040232195e2ad52
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 0.9632

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 https://netcdn.xyz/app/406889139/instant-free-spins-coin-master-game-hack PDF link annotation
    • http://library.fk.upnvj.ac.id/repository/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.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_003_off00004ade.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADE 25324 bytes
SHA-256: f66faf2400825ae6b8e747699e1be541f2c78c22748d51013855c63760f756f6
font_01_sfnt_off00008462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8462 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E14 17884 bytes
SHA-256: 548329156333db4fa61a63bcdda2f5f8d49c53e924025ea46218be7e94f839d9

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