Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e54f1ccf98a9fb6…

MALICIOUS

PDF

55.4 KB Created: 2021-06-03 07:10:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3b5a4c701dd78efc92d95da61b495d5b SHA-1: f1b536ba8b1e7b78d9b48f14d4557cec647951b9 SHA-256: 3e54f1ccf98a9fb6ba4bb0d7a7b8a62dcd816bf71c66e615bb9d9142ff68f6ba
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 0.9718

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/roblox-free-robux-game-hack PDF link annotation
    • https://www.knjiznica-oroslavje.hr/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/minecraft-mod-menu_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-items_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.roblox.comIn 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_off00005225.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5225 26236 bytes
SHA-256: 05d80b95ace7569968012458d99d1e20d24a0442b98118b3ed3b31b56f4ced68
font_01_sfnt_off00008f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F48 12800 bytes
SHA-256: db399d969d9309c9c38cb6e3c43aa83c06d227a5470715de93176d1df1e6747d
font_02_sfnt_off0000b725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB725 18088 bytes
SHA-256: 03c92d59c548fbfdae08874221752d30f8caaed88781636bf7d18542e7c5fe52

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