Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e66d1ad67befc28…

MALICIOUS

PDF

43.1 KB Created: 2021-06-14 01:43:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fc080f985d042ada2ab37d18bc8997c5 SHA-1: 92fed7c6ef4826d1c2a98a3279824063f5fe16c0 SHA-256: 3e66d1ad67befc28a5faba6938d20e5cbfd2901713916502fc45896d0629b195
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 0.9971

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 http://netcdn.co/app/431946152/how-to-cheat-robux-in-roblox-2021-game-hack PDF link annotation
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/tests-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-builders-club-roblox-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/script-for-free-robux-vid_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/rexima-roblox-cheat-for-apocalypse-rising_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/real-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/shinobi-life-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/strucid-aimbot_GM431946152.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_003_off000049c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C1 25768 bytes
SHA-256: 1d17dc9998f9157957804ad6017f1f2bab84cde4f2e0a4ba373e01df25b1140c
font_01_sfnt_off000083ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83CE 18988 bytes
SHA-256: ea4344345edc45398d2e7fd4ef0c57c755c39374dbe7009b4445efabefa08f5b

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