Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b1f959d0653556…

MALICIOUS

PDF

34.2 KB Created: 2021-07-20 18:31:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4d6086932c405984a14994fc6cb36b65 SHA-1: 0b9b3ead8df70e3f7bd1aa002edb42965e4229da SHA-256: c8b1f959d0653556fe45de14986c31fae44b0200ba045e50aed8a42f3b404fd4
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 0.9955

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/479516143/how-to-make-a-minecraft-server-for-free-game-hack PDF link annotation
    • http://library.sdkmaterdei.sch.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://library.sdkmaterdei.sch.id/repository/free-minecraft-survival-server_GM479516143.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_off00003078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3078 22960 bytes
SHA-256: eb8e10cbedd8a3bf0b42623e55165ee961b95222507fe37d14b073e4807a3dd4
font_01_sfnt_off0000640d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640D 18156 bytes
SHA-256: 7ebd6cc6f7d73451d43dfe99dc02d56d86c4e3c51693199467050b16fbe82799

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