Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfd341adf4503aa…

MALICIOUS

PDF

227.0 KB Created: 2021-07-06 01:12:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 000ec7b88a7bb0eb822e31c6ca087b03 SHA-1: d1d22f9b5a96b9f0ac8d677de8b8a2c76aabacda SHA-256: 5cfd341adf4503aa3eae77bc5bbe5480d0e68b868cf270fcb7447a10a5bf8c0b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a social engineering attack, employing a fake CAPTCHA and a browser update lure to trick the user. It contains an external URI pointing to 'netcdn.tw', which is likely a malicious domain used to host a secondary payload or phishing page. The document's content and heuristics strongly suggest an attempt to deceive the user into performing an action that leads to compromise.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 6

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/1094591345/pokemon-go-free-7km-eggs-july-2021-game-hack PDF link annotation
    • https://pn-tapaktuan.go.id/pustaka/repository/get-free-robux-on-roblox-no-human-verification_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/hack-clinet-for-roblox_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-exploit_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-jailbreak-hack-jjsploit_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-how-to-hack-accounts-2021_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-source_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/alphalife-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/nilamyt-free-robux-socialblade_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-generator-without-verify_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/we-hack-com-roblox_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/ben-10-universal-showdown-roblox-cheats_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_023_off00031df1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31DF1 25576 bytes
SHA-256: 84376dbeb67517beaff5cec2954484e5adbefbe5864f54a5ccfad72d68aefeed
font_01_sfnt_off000359f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x359F2 19376 bytes
SHA-256: c7cbdb5f422440d4ca63c168ccc647551b3fd865cf9446676abf2e1cc60f0e4c

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