Malicious PDF — malware analysis report

Static analysis result for SHA-256 215a559f869d1c66…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 11:26:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c3e686ea75788fbbc02af5f5424c46b3 SHA-1: 9e97d9d00c08c0c3c8af2fa758f7e0b684b58d91 SHA-256: 215a559f869d1c66638a329eb2c3349f13e3a25413ed1be7b0c93df7c45268a5
122 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links, specifically targeting users interested in game hacks and generators. The embedded URLs point to websites that likely host further malicious content or facilitate the download of additional payloads. The ML classifier strongly indicated maliciousness, supporting the observed lure and redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-strucid-privet-servers-roblox-game-hack PDF link annotation
    • http://zercalo.org/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-make-a-free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-build-a-boat-for-treasure-hack-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-admin-commands-free-download_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-meep-city_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-earn-robux-for-free-2021_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50AA 26384 bytes
SHA-256: 9b6e95fe3e51a793a0f60b24c4e12a48a97a167f127dca6ad75536fb9e53f363
font_01_sfnt_off00008cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDA 18752 bytes
SHA-256: 8fad72501357762e6e35ea6c100c41373913506e4d3f9ad614c5ec616b0d31a7

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