Malicious PDF — malware analysis report

Static analysis result for SHA-256 5529d6b9c1c55723…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 06:51:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 72617d4e7c4b3ee08904250bfc5c45e8 SHA-1: 1e0135eaea75704bf4b2faf4353c57c383977543 SHA-256: 5529d6b9c1c557235691c23d41bcf898ba6b3b4ddf4e92294943cd7b972da725
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.online/app/431946152/free-robux-games-that-actually-work-game-hack PDF link annotation
    • https://perpustakaan.stami.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/rbx-com_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-free-wings_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-hair-for-free_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
font_00_sfnt_off0000538f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x538F 27916 bytes
SHA-256: 00ff335bd87c13e72deaed53079c1639d889da9101fed56ebed6a09cedbf382d
font_01_sfnt_off00009196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9196 19392 bytes
SHA-256: 2bd118a57b53ff37cab680797aee460eb59fed046ceba4ed0277135d7eae5baa

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