Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2556f84a9b85286…

MALICIOUS

PDF

49.4 KB Created: 2021-06-03 14:28:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 92c2d3795bf0e7b1d9690621ae2b999f SHA-1: 3acc53d088fba257eead2c4f2227ce9b5ea0debe SHA-256: c2556f84a9b85286b12179f4238c94087e192fa90fd109d04ea3a94bfd7f5d7a
122 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a primary focus on luring users with game hack promises. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of a fake CAPTCHA prompt indicate a social engineering attempt to trick users into clicking malicious links. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirect URL which likely leads to a second-stage payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/robux-today-game-hack PDF link annotation
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5320 27284 bytes
SHA-256: 2ca777165ee375705997af45eb07ce310ead3b12c8730b874fb0b2c00a98e938
font_01_sfnt_off0000910d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x910D 3656 bytes
SHA-256: 9f0b708049ba3a27fe71af9d3da5d823b566ea88c56b157492a6ea759b34d87c
font_02_sfnt_off00009dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DCA 18432 bytes
SHA-256: 959daec5ee9bc3c71d76c0b44e5e7b2fade628e041cf04f050b5917282f814df

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