Malicious PDF — malware analysis report

Static analysis result for SHA-256 f503ec8674df968e…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 07:45:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4ef956d92c42451ce6eecccd95cdb719 SHA-1: 1fb9bcf005890ef2e275bf64e0d06cc8c3d0aaa4 SHA-256: f503ec8674df968ed1a9b12488fe663d41b65d34a7f71091953d2621551f3952
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and websites offering game hacks, indicating a lure for users to download potentially malicious content or visit phishing sites. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs suggest a social engineering tactic to trick users into clicking through to harmful destinations. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.tw/app/431946152/roblox-free-no-download-game-hack In PDF document text
    • http://www.my-travel.com.hk/upload/files/get-free-robux-by-downloading-games_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/muffin-combat-hack-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/robux-hack-windows_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-to-get-free-robux-without-putting-in-yo_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free4mobile24-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-mad-paintball-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/how-to-get-roblox-coins-for-free_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/roblox-royale-high-cheats-for-diamonds_GM431946152.pdfIn PDF document text
    • http://www.my-travel.com.hk/upload/files/best-way-to-hack-roblox_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_off000033b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B0 22316 bytes
SHA-256: 03545416d1bbbb435c48529e6093e4b45770044545a65119ab2263165ff9f5f4
font_01_sfnt_off0000651c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 19156 bytes
SHA-256: ba179ae70ead152b01ae8f27451fe6f8d609efa6e1c0129b35fe0e54807ded44

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