Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b082a20ce755ff…

MALICIOUS

PDF

45.0 KB Created: 2021-05-11 04:31:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1aee1e0d7ea4c2d51661b4635ac3d081 SHA-1: 5bf718f9ca43dae9b67db8261c19e20290335ed1 SHA-256: c5b082a20ce755fff67afb944812d3c2496f90dd441a21f6221ea11ab528534b
122 Risk Score

Malware Insights

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

The PDF document contains a link to a website promising free Robux and game hacks, presented with a fake CAPTCHA lure. This indicates a social engineering attack aimed at tricking users into visiting a potentially malicious site. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/431946152/i-want-free-robux-game-hack PDF link annotation
    • http://perpus.wdh.ac.id/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/freecoins_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/como-hackear-el-juego-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_off0000493b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x493B 24932 bytes
SHA-256: 4ea8d91e18e36ffab1d0c07e4d6f42291e66dab4d33e1554a5e89da5bf1d7c5d
font_01_sfnt_off000082b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B6 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C68 18544 bytes
SHA-256: 21c84a9f4ed3b5496a815e3404d7d5cd07faeb2ee17584cb0226aa903f450845

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