Malicious PDF — malware analysis report

Static analysis result for SHA-256 a273bd9a141fff54…

MALICIOUS

PDF

44.6 KB Created: 2021-06-08 23:29:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6486c9655cb578b5116dc0022e905961 SHA-1: af4d6deda1d121e0307b6913ab28627c0b0114b7 SHA-256: a273bd9a141fff544143df7b63f142a71f0e6e50d3cab8e324f4c7cd4bc8438d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing and 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 0.9865

Heuristics 6

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/free-roblox-account-getter-game-hack.
  • 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-roblox-account-getter-game-hack PDF link annotation
    • http://www.gox.pt/images/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • http://www.gox.pt/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://www.gox.pt/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/roblox-bloxburg-cheating-codes_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/coin-hack-for-assassain-roblox_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://www.gox.pt/images/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.gox.pt/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.gox.pt/images/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.gox.pt/images/roblox-account-hacker-tool_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_004_off00004ed5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED5 26912 bytes
SHA-256: b4731c1945fa7c99c82b8a3659eb3d1cfff3d38f87719dc6183ef769e93a0d02
font_01_sfnt_off00008c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C24 18192 bytes
SHA-256: 5a9bf2e0cd9d6b788677e1f119fb8773291c20ada0b475af849acabbf509c2ef

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