Malicious PDF — malware analysis report

Static analysis result for SHA-256 3901f7911e172a7a…

MALICIOUS

PDF

46.7 KB Created: 2021-06-02 20:31:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d4bb442af7953c8c41830543e9b5fa61 SHA-1: cb9a1052018216b65e41e6a7febcf217f71c0888 SHA-256: 3901f7911e172a7a14200dce3ba6a23113a82abda84f38bf8048837e8d271f0e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic indicating it links to a 'free generator / game hack' redirector, specifically targeting users interested in Roblox Robux. The embedded URL and numerous other similar URLs found in the document support this lure. Although no scripts were extracted, the PDF structure and the nature of the lure suggest an attempt to redirect users to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • 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/431946152/roblox-robux-hack-2021-pc-game-hack PDF link annotation
    • http://krumerhaus.at/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/best-meliodas-roblox-face-free_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/static-moonactive-net_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/roblox-free-wings_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_off0000500c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x500C 29052 bytes
SHA-256: fe3a88d054dbfa7cf04c2e253e4bc726896419be954d54fae07ef1b321074909
font_01_sfnt_off00009230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9230 18876 bytes
SHA-256: 855a5fb791dd8fe04bb1266f96a7c62f56d2c43ac2c094ef52f73ff46cca46a4

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