Malicious PDF — malware analysis report

Static analysis result for SHA-256 849cce4178e78aad…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 06:19:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7e147ce5678ce9151816809fbe1253e0 SHA-1: 8e81e8818a8c62302932064489bfa005f04d1279 SHA-256: 849cce4178e78aad4abcf6f12a02442a07e265aead39664603ede178e63b89e8
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and embedded text that promote game hacks and free spins, specifically for games like Coin Master and Roblox. These links redirect to external URLs, such as http://netcdn.tw/app/406889139/coin-master-free-spins-no-generator-game-hack, which are likely intended to host further malicious content or phishing pages. The presence of CAPTCHA-themed lures and download button lures suggests a social engineering attempt to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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.tw/app/406889139/coin-master-free-spins-no-generator-game-hack PDF link annotation
    • http://perpus.wdh.ac.id/repository/free-robux-generator-no-survey-or-captcha_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/robux-gainer_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-cheat-engine-money-hack_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/can-you-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-make-a-anti-hack-script-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-draw-1-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/horror-elevator-roblox-mega-vip-free-2021_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/hack-peoples-roblox-account_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
font_00_sfnt_off0000307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307B 23076 bytes
SHA-256: 21218d6d67ea4548614706263e1e6aad9aac35455e24177c6a514cc37e9dc5f1
font_01_sfnt_off00006459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6459 18176 bytes
SHA-256: 77c96ce1f1240076ebae8e0b9f71290cf4df32d1dbcc09d34a4bb131e3b5cb60

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