Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7aefb32f5ea504…

MALICIOUS

PDF

33.3 KB Created: 2021-07-05 21:24:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 193d5b87fe3b74cb1d84a1db99e20239 SHA-1: 4d858dce046bc049232173ab7583c9b7d3325c47 SHA-256: 4b7aefb32f5ea504bb68debb2bd41e8e636597650c914b227d0d86decedd5f07
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 0.9980

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/406889139/coin-master-spin-ml-game-hack PDF link annotation
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-homepage_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/pubg-uc-full-form_GM1330123889.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/a-person-hacked-roblox-for-sex_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-phantom-forces-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-accounts-nbc_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-free-superhero-package_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-online-play-hack-for-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/como-hackear-coin-master-gratis_GM406889139.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_off00002da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA7 22564 bytes
SHA-256: 0b3e6d97cd5762e8c225d8d684e3882c6055a4798259dfecf23fcc5f2761ade4
font_01_sfnt_off00005fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBF 18084 bytes
SHA-256: d0f847134178a2f8fffac17547c1a4781e9d989e6f7119da2e268a8362f52d9d

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