Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dfe58ce46f1f54…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 09:09:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 94264688b77326282aa24581f872ef7e SHA-1: f70719b495c0e3981f39a418ea1dba292a99d55c SHA-256: 87dfe58ce46f1f545a67338c2ad91acf058894fa0abaad983e6a68ce8084edfe
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 0.9769

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.online/app/406889139/how-do-you-earn-free-coins-for-coin-master-game-hack PDF link annotation
    • https://www.itc-nekretnine.hr/files/roblox-free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BE 24764 bytes
SHA-256: 1d43ab213336b83430797576d726095958ae4a3b49b3b7db942fac39bb4e318e
font_01_sfnt_off00008928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8928 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00009510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9510 18344 bytes
SHA-256: 5806cda21877127dbf589a3d7d7b31f937fe3ba1f3a16df07ebea42887c1a658

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