Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a2e7e762ed9fca…

MALICIOUS

PDF

48.8 KB Created: 2021-06-11 10:08:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d20c807bc0b5e2f381322d90423198ee SHA-1: a9a99fae7d36bfc74b053547f4c3e4cde15f6224 SHA-256: 28a2e7e762ed9fca7bc03a85f39bf51f1c1711252bb8596509e85b4fb0c414ac
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 0.9871

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.tw/app/431946152/free-robux-generator-2021-roblox-hack-no-survey-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info/repository/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-regen-roblox-workspace-if-a-hacker-deletes-it_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/hacked-roblox-accouts-username-and-password_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/boost9-com-roblox-hack_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_004_off000052d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D1 30660 bytes
SHA-256: b9ca6d52765cbdb5c3c8f6c0fc96c1f1f52216d8627702bf6d218562d0c2f17f
font_01_sfnt_off00009921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9921 19288 bytes
SHA-256: dc37d3e6124468c754cddeca132b40194e5edb4ce07c8b927c7a6e11511b69ba

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