Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c97fdd3a0afb4e…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 21:14:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4ce9ab2688e6b5aa4859f5a3f8994ab5 SHA-1: 84dbe68170ebec30445965d8db6e4f47acfafe5b SHA-256: e5c97fdd3a0afb4eda4c8da2f16794e0c1a89b302254fc34425688e438009f1d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and a large number of SEO-optimized PDF links, likely intended to lure users to malicious content or phishing sites. The document body and heuristics indicate a lure for game hacks and generators, directing users to URLs such as http://netcdn.tw/app/835599320/tiktok-viewer-free-game-hack. No scripts were extracted, but the PDF structure itself facilitates the redirection and link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/835599320/tiktok-viewer-free-game-hack In PDF document text
    • http://www.3d-gold.com.hk/upload/files/phantom-forces-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-welcome-to-bloxburg-money-hack_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-studio-free-download-mobile_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-2021-app_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/glitchtale-battle-of-souls-roblox-hack-jult-31-2021_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-games-on-roblox-real_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/no-human-verification-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-tiktok-app_GM835599320.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/como-robar-cuentas-de-roblox-con-hacks_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-place-view-bot-hack-forms_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_off00003307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3307 23088 bytes
SHA-256: 233c39494cc943e6a12e6c55593823f60ad736af488ff00135f44fd235f8df98
font_01_sfnt_off000066ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EC 18268 bytes
SHA-256: 93eee72dea4227dcc5800322e3f0c8a3d1ec1d67827839ae5243ce7f2512eb80

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