Malicious PDF — malware analysis report

Static analysis result for SHA-256 34119747b1c6ce3a…

MALICIOUS

PDF

49.7 KB Created: 2021-06-09 03:02:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7c846b9dbd6a12d860ec54fa5b780d35 SHA-1: 26191914021647df90792adf9481204bf6c50319 SHA-256: 34119747b1c6ce3ae2e75782521bbc3209528cf3ccc0ffbb7812509a83f05f45
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document displays a fake CAPTCHA to trick the user into interacting with it, which is a common lure for malicious PDFs. The embedded URL points to a resource that likely hosts a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • 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.tw/app/431946152/ho-to-get-free-robux-in-roblox-on-the-pc-game-hack PDF link annotation
    • http://d-cision.nl/images/free-shirts-roblox-free-shipping_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/get-robux-now_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://d-cision.nl/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://d-cision.nl/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://d-cision.nl/images/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://d-cision.nl/images/coin-master-ios-hack_GM406889139.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_off000053b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B5 29124 bytes
SHA-256: 3a0e31c6b4c42376bf591222a5b74b13e99c0454a10e35ab8d2aca8b5c24d244
font_01_sfnt_off00009534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9534 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1E 18512 bytes
SHA-256: 10833e9e9e9d50697c66a97006f9fdf736ea5c8231f0e126aebd4a8a83768e07

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