Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c87f7dfbb518e1…

MALICIOUS

PDF

226.7 KB Created: 2021-07-03 22:21:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bb8671a988a99d641b2514935d36d76a SHA-1: fe3970ff9d342c17848e0545784194404bbacbb9 SHA-256: d4c87f7dfbb518e1ccc5d40930c03989bb52204efaa00f94b71fa7adb26d6b7e
132 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it presents a fake CAPTCHA and a browser extension installation lure to trick the user. It also contains an embedded URL pointing to a potential download, suggesting a social engineering attack aimed at users seeking game hacks or VPNs. The document body, though heavily obfuscated, contains references to 'Pokemon Go Free Vpn Android' and a URL that aligns with these lures.

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-vpn-android-game-hack PDF link annotation
    • https://alimi.com.tw/upload/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-robux-hacks-fo-pc_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-how-to-make-a-game-thumbnail-for-free_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-to-use-roblox-ads_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-roblox-military-script_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/how-to-hack-aimbot-in-breaking-point-roblox_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-daily-free-spins-link-today_GM406889139.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_off00031e36.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E36 25576 bytes
SHA-256: c9eecd90a7d66141a4a5426fc6be1dcfbf300ed9707a1dbd4b48f930161ce3e5
font_01_sfnt_off00035a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35A29 18964 bytes
SHA-256: b00ffe2d14adec3283c1b49206080ed17c651d7deada348ff727aefcb867fe36

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