Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad371c8abae8295…

MALICIOUS

PDF

45.2 KB Created: 2021-04-27 22:34:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6930689a259fab7679be6aa5dd5ec3b0 SHA-1: fb61e5006e3dd633ede1e325ad36e4f8fa7e34cd SHA-256: 4ad371c8abae8295c933405ee28ea7cde09b5c51dc1fd949b4ba4c5f6cf1bcfa
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free Robux generators' and 'game hacks' to entice users. It contains multiple links to external websites, including one that appears to be a redirector for malicious content. The presence of invisible links and CAPTCHA-themed lures suggests an attempt to trick users into clicking through to potentially malicious sites. No scripts were extracted, but the document's structure and embedded links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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.xyz/app/431946152/robux-free-genorator-no-survey-or-humaan-verifaction-game-hack PDF link annotation
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/dbs3-roblox-hack-script-pastebin.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-2021-june.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/tokyo-ghoul-project-killzone-roblox-cheat.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-robux-website-survey.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/innovation-hack-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-invitations-free.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/free-promotional-codes-roblox.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-get-free-robux-no-captcha.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/roblox-royal-high-free-diamonds.pdfIn PDF document text
    • http://www.nlcitychurch.org.hk/upload/userfiles/files/how-to-buy-roblox-for-free-on-windows-10.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_off000042de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42DE 28092 bytes
SHA-256: a9e7cbdfdc22401b44130ef45129bcd0d38ba0c403723dd1a233d4cabea6e961
font_01_sfnt_off00008273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8273 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C23 19156 bytes
SHA-256: 25ee2337ba73e76a11bcd6ddd89b3174d94316d1b2c7ac65a3805816d80a5c08

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