Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71616bc76fc7c33…

MALICIOUS

PDF

42.2 KB Created: 2021-05-11 08:35:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 34944a19c8e62db36b7d11a4becb46d9 SHA-1: 45955b4d23e45319ff64b9852563fb75fbe6aea4 SHA-256: d71616bc76fc7c33de6544a20e073f4c96c594eb724045650edb474ae76ada8e
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and SEO manipulation. The document body and extracted URLs suggest a lure related to game hacks and free currency, likely intended to trick users into visiting malicious sites or engaging in fraudulent activities. The presence of a fake CAPTCHA heuristic further supports the conclusion that the document is designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/best-way-to-get-free-robux-game-hack PDF link annotation
    • http://wiesbadener-marktplatz.de/images/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://wiesbadener-marktplatz.de/images/how-to-get-free-robux-on-computer_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_off000049e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49E6 24724 bytes
SHA-256: 125b67e0fab7afb261fc994f60632816badd5e4d445f9f6c8e8e446c9164d6a9
font_01_sfnt_off000080e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E3 18724 bytes
SHA-256: 0e67c697191027b8b448214b8413bf6f3ed0ff1165507b95d6a34aabcad7a82f

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