Malicious PDF — malware analysis report

Static analysis result for SHA-256 71df3e311cc796ce…

MALICIOUS

PDF

33.2 KB Created: 2021-07-08 12:01:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 757f59961dff7201d9e85c8b00dd1c06 SHA-1: fc9fc7dbd8478549f3ceb1789a8338d9c9e940c2 SHA-256: 71df3e311cc796ceee7365d32a51e40ac87240f46e6585b9b553bf046e881fd3
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a call-to-action to trick users into clicking a link for 'free Robux' or 'free spins'. The embedded URL http://netcdn.tw/app/431946152/free-robux-safe-game-hack, along with numerous other similar URLs, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and content indicate a lure for potentially malicious downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-safe-game-hack
    • http://polycraft.ae/uploaded_files/userfiles/files/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/hackear-coin-master-espaol_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/roblox-hack-injector-2021_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/free-roblox-logo-favor-bag_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/hacks-adopt-me-roblox_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/blogspot-coin-master-free-spins_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/roblox-cheats-to-get-free-builders-club_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/who-did-the-hackers-hack-in-roblox_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/get-free-robux-now_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/hack-coins-in-coin-master_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/huskybuckscom-free-robux_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/free-texture-packs-for-minecraft-pe_GM479516143.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-claim-spins_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/free-outfits-roblox_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/buy-robux-free_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/free-robux-cards_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/minecraft-server-hacks_GM479516143.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/free-spins-coin-master-daily_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-daily-free-rewards_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/free-robux-no-scam-no-survey-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d44.bin
7f2329ba887b7139f5e9986300b8b850a2f4bc52c2b0b8dbbd9325a888d1310a
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D44 21888 bytes
font_01_sfnt_off00005d81.bin
10dbf18a398b54dbdf12e35bff00225a1ca49c244028279e5f56b846bcc4a5be
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D81 18716 bytes