Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c1532a13c111dd…

MALICIOUS

PDF

45.1 KB Created: 2021-06-11 10:16:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a84243eab2d7473b9d02f7321c2abbc0 SHA-1: 11131bf0d0332b88c97751e11666e6ea986d35f9 SHA-256: 14c1532a13c111dd9ef4bfc51ad46bc189c219dd0d56a51ee10ed57bffba97c8
82 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and displays a fake CAPTCHA or human verification prompt to trick users into downloading further malicious content. The ML classifier also flagged this PDF as malicious. The presence of multiple URLs related to game hacks suggests a lure for downloading potentially unwanted or malicious software.

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/roblox-personal-server-hack-game-hack PDF link annotation
    • http://unilin21.ru/images/free-avetars-on-roblox_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/save-pikachu-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/pokemon-go-accounts-free-list-2021_GM1094591345.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/games-on-roblox-where-you-win-a-free-rixe_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/robux-hack-only-download_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/update-coin-master-free-spins_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_004_off00004f59.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F59 27080 bytes
SHA-256: 1b5886967bb8da4ca27a6c675cb2e071eb3362485d2483fc107a7a8f28fec387
font_01_sfnt_off00008cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF9 18452 bytes
SHA-256: 7d61070b05d2418f86d3b42f09951f27686aa5d3cd3aa99c64ce5c188e624b70