Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9c353601e52ac0…

MALICIOUS

PDF

34.5 KB Created: 2021-06-18 16:59:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 05b97e8078a01459ee4531b99096ece5 SHA-1: b54fa10c5e3fce209c3e768be6030493d32031a1 SHA-256: ca9c353601e52ac094f618f73eb670ebc452718e4fd9ef7333961170c5e9235b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to a known malicious redirector, likely serving as a lure for game-related cheats or hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button heuristic further supports a malicious intent to trick the user into downloading potentially harmful content. No scripts were extracted from this sample.

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/roblox-unlimited-money-hack-jailbreak-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/robux-win_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-via-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/btools-hack-roblox-2021-not-rar_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hacked-shirts-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-real-2021-500_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/huskybuscom-free-robux_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_off00002eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB8 21964 bytes
SHA-256: 0ba8619a57477320d5cae1c0e800030f4fc2adb9d5a5753313ed73818d24026e
font_01_sfnt_off00005f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F79 19856 bytes
SHA-256: 49a5992ec00240efa86e36dd1a295b83f6b69e62f3bc32fd7da8f6de10f78725

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