Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc015c37fe60c2d8…

MALICIOUS

PDF

46.7 KB Created: 2021-05-14 12:52:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9e9ca94c2fcab3c1c32f32e510811484 SHA-1: 153f020eb217718dfb37566ba8934798eaefa103 SHA-256: dc015c37fe60c2d875e8a4311b00fadd30a315296e575b2058be218f74766a64
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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.xyz/app/431946152/roblox-hacked-accounts-list-game-hack PDF link annotation
    • https://www.gornjastubica.hr/files/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/robux-generator_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/spin-hack-for-coin-master_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_003_off00004873.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4873 25200 bytes
SHA-256: e2b10ec951ba1d8358fa772d07634ede63178e38e121ad09acab3debe5f83c71
font_01_sfnt_off0000825d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x825D 6700 bytes
SHA-256: ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27
font_02_sfnt_off0000929a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x929A 18720 bytes
SHA-256: fc7b133a6c1dcbd831a87427d92a14fbfb4bbc577a85d8c62e04ee2ff9906700

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