Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b17f31ef1265d2…

MALICIOUS

PDF

49.5 KB Created: 2021-06-03 14:41:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: af297fd81c50142461bf7b78f1c4569f SHA-1: 4ee765ce5f5a1aefb9f1dd92fd80e57c3f575ce8 SHA-256: 72b17f31ef1265d2ed35cebeb8484df05eb64930f83386198d634556b05efa18
130 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure and an urgency-based 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 0.9871

Heuristics 6

  • 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
  • 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.online/app/431946152/free-robux-without-verification-or-survey-game-hack PDF link annotation
    • http://digilib-unirow.ac.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/tiktok-free-to-use_GM835599320.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-mod-version-free-download_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_off00005200.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5200 33360 bytes
SHA-256: 152be336903d491220d40996e6fa7773aec1fe8a71e2f3b749ce68cb95293168
font_01_sfnt_off00009c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C6E 19256 bytes
SHA-256: e141b644a4ecfde99000ea6fb335fe57c508717aca49a84e1609c2cc829300c4

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