Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31d6e90878935bb…

MALICIOUS

PDF

45.3 KB Created: 2021-05-14 10:12:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4b4cdfe7a18aca84fa04c3c8aeed9405 SHA-1: 0906f31b4e0315df16a6bed45a9fc755673c15d3 SHA-256: f31d6e90878935bb020ec190a9b07a84ee7c51772e7a8829704b775c5f2bff8e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The document body, though partially corrupted, contains text related to 'Roblox Free Exploits' and 'CLICK HERE TO ACCE', reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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 https://netcdn.xyz/app/431946152/roblox-free-exploits-game-hack In PDF document text
    • http://mohacad.hu/images/roblox-demon_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-cheat_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_off00004840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4840 29652 bytes
SHA-256: 53c7612759a47f577868a2b6b83d3fcf3a2ec7362a5bf57e3eb02fe2c106ba4a
font_01_sfnt_off00008ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC6 18348 bytes
SHA-256: 6c925dd72bfdbeb9e5985c11867b62b97a75752c64c0caf4da45c40d6edb98e2

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