Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba781074c4d31eb6…

MALICIOUS

PDF

46.9 KB Created: 2021-06-11 12:12:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 016d371711581e8f28da7bf5d7cd76c1 SHA-1: c0706a0655ead313646b285dab4b342fd2c0e2eb SHA-256: ba781074c4d31eb69f1a886dca2c41329b7b82e95174434efdac47525c1acfb6
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9832

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/real-roblox-lumber-tycoon-2-hack-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/roblox-hack-models_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-free-merch_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/animation-editor-free-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/pubg-uc-meaning_GM1330123889.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/visea-descargar-hack-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-robux-easy-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_off00005366.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5366 27028 bytes
SHA-256: d7ab918b9721fdcd7658e90a8ed498edfce62a3f472c421052180a8d23740a07
font_01_sfnt_off000092d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92D9 18888 bytes
SHA-256: 84aaab08e967228aaadf86ecb33c25c9e61184a77ec4e1742b332974c1920cd2

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