Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac1d05befdddfac…

MALICIOUS

PDF

30.5 KB Created: 2021-07-19 23:45:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 74cdadc88ce1fd54f45f722de16e8d7b SHA-1: a9bb7a8852b744912138b8646e6f0fc5207a7ebb SHA-256: 7ac1d05befdddfacb4739bce260363d67d2074fedea284f3acf5d433724a4837
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 0.9415

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/free-minecraft-pe-server-game-hack PDF link annotation
    • http://tapinkab.go.id/assets/CKImages/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/how-to-get-robux-for-free-2021_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
stream_002_off000023da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x23DA 22764 bytes
SHA-256: 791ae6715d3a0de2f1b201fbf4292588fb099519b10e20ca6fa4676eb98d3d1f
font_01_sfnt_off000056cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56CF 17836 bytes
SHA-256: 40ba9e4e6a96b9fbdb66fe1c3cdc29181d81f4b56a4eeac74a5dcf6bc0460396

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