Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49776e57e0b3bb1…

MALICIOUS

PDF

34.8 KB Created: 2021-06-27 22:19:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6e65a6e72eb9345689fa9e6fb65692c3 SHA-1: 2f4d828c6d284998fec1f4430dc929a37d513ac0 SHA-256: d49776e57e0b3bb14d092ccd9db3ced3ee481e12e1a8b51b9763e05770757f5e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded URLs, with a primary one identified as a malicious redirector. The document body and heuristics indicate a lure for 'free Robux' or 'game hacks', designed to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.co/app/431946152/free-robux-easy-for-kids-fornoobs-game-hack In PDF document text
    • https://www.metal.hr/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-hack-a-site-to-give-you-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-now_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-group-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/proto-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-clothes-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.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_off00003090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3090 22444 bytes
SHA-256: 6b15896ff3bbf3d160c71fa6e2d1a2c857de610401243a3e18a34d49e4e54ab1
font_01_sfnt_off00006283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6283 19188 bytes
SHA-256: 9ee65a1031ac338fe8a4c73ed66d034e145a44dd17ba4a578f8c01254aa9dec3