Malicious PDF — malware analysis report

Static analysis result for SHA-256 463e758e71cddb28…

MALICIOUS

PDF

46.8 KB Created: 2021-06-10 14:50:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4458a6017730cfaa6aa822c6e710fffe SHA-1: 58911a2baee2cb1145039ad9f4cab787ca07229a SHA-256: 463e758e71cddb28f9405c80593b6825eb54de92b2905f5db74c03b7379b3d25
90 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a call-to-action to obtain free in-game currency, which is a common lure for phishing or malware distribution. The embedded URL points to a site offering 'free crystals' and 'game hack', further supporting this. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/code-how-to-get-50-free-crystals-roblox-miner PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-no-survey-or-verification_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-hack-console-download_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/rosenberg-roblox-hack-pain-access_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://rblx.landIn 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_off000053dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53DC 27420 bytes
SHA-256: a16ab0f67fd3dc8d95caa078deefa10661e366ced6296ffea9408ed8fa6e4def
font_01_sfnt_off00009072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9072 19600 bytes
SHA-256: 822b22d6d8c55312d18f15d9c629237c657ece5754e335319db5da2a6e6d76e4

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