Malicious PDF — malware analysis report

Static analysis result for SHA-256 718bb52e5abf30d4…

MALICIOUS

PDF

34.5 KB Created: 2021-07-10 03:28:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ebcce8e54b950475e8104e66f2e5275e SHA-1: 494a558a7eef365cdb57d2707987bcb5a0642837 SHA-256: 718bb52e5abf30d4ba7e385b268a1472af65e7c360db80ee24ec6f9d9677df88
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as content related to game hacks and free in-game currency. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely serve as a lure to download further malicious content or redirect to phishing sites.

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/how-to-get-free-robux-hack-game-hack In PDF document text
    • http://mbbs.hr/files/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/hacks-for-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-pe-apk-download_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-in-roblox-no-download_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-airpods-tiktok_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/zephplayz-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/como-hackear-roblox-para-tener-robux-2021-pc_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-groups_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/site-de-hack-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-invisible-hack-cheat-engine_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_off00002ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA4 22712 bytes
SHA-256: d7dcf6dd18c98d16b77f596c9bb606b52a825c35e7507d2caf034338a67f93b9
font_01_sfnt_off00006186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6186 19152 bytes
SHA-256: a9bff55de90b7722e0be476df1c7a65da1171d9638b3b21a902752e59eae7e63

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