Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d2abea1846f5af…

MALICIOUS

PDF

45.8 KB Created: 2021-05-15 00:27:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ebaa6d73de92b6b430c3ed3ac271f405 SHA-1: 99f2470325f6e2d809912ea4c5861db649ed2ad1 SHA-256: f7d2abea1846f5af14cc4efd06782622e05f60dafb86dedca3273c1b06f7a216
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO link farms for game hacks and cheats. The document body and heuristics indicate a lure for game-related exploits, likely leading to malicious content or downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.xyz/app/406889139/coin-master-date-and-time-hack-game-hack PDF link annotation
    • http://bemviverclin.com.br/images/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a8b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A8B 25320 bytes
SHA-256: 912d67184a20f4c5458d35dbf5163e31e97ecad90f3355139855e4bef5cef9ff
font_01_sfnt_off00008527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8527 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9051 18316 bytes
SHA-256: 7bb22083c9314811711c29236537d9b39d24df6e47e77b9ae9fc3b3f4254db81

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