Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39383b7fd89161e…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 19:54:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8bc876bee3216b1440ba1864cb35e4c0 SHA-1: 26d6dca1d2466983705807e5a66c19f4680e4a73 SHA-256: c39383b7fd89161e84839d178bda049d191128b2813d683c53d4100ddfb306da
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/get-free-coin-master-game-hack PDF link annotation
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/give-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-skywars-mega-vip-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-hack-for-life-in-paradise_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/rbx-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/blox-fish-free-robux_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_off00003190.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3190 22372 bytes
SHA-256: 21e6d76d34ff4a6fc7e63055f9184f69041ff28bace8c1a2e7ed2558b327b82d
font_01_sfnt_off00006369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6369 17996 bytes
SHA-256: 2218a26fc20f3381b15a6c1d56b0fba8ed575611d7fe9869e239c8e40abe84e3

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