Malicious PDF — malware analysis report

Static analysis result for SHA-256 63571ba80cde5f6a…

MALICIOUS

PDF

44.9 KB Created: 2021-06-08 21:57:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 87cad1641cdc87b5121b0497c5ef9012 SHA-1: 66ff162ef17b15708a667ae9bddbff9694e48c6f SHA-256: 63571ba80cde5f6af31ad4eeab62ba96038d36b00c2c8e9ac57816576aee655b
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious content. It also embeds external URLs, one of which is directly linked to a 'how to get free promo codes roblox' scam. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of a malicious payload or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/how-to-get-free-promo-codes-roblox-game-hack PDF link annotation
    • http://unilin21.ru/images/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/tiktok-views-free_GM835599320.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-free-shirts-and-pants_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/what-games-on-roblox-give-you-free-robux_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
font_00_sfnt_off0000518c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x518C 25272 bytes
SHA-256: 089273537798b6c3b7ca769eea80e6c77c6c1fe9e6ab1a5260841a0fc9b26f3c
font_01_sfnt_off00008b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7E 18804 bytes
SHA-256: 08a18d40d2e9a4505f577380dd73de4973e12b0a15a5656358943cade4f61de8