Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81b8ebcdc764d5e…

MALICIOUS

PDF

35.0 KB Created: 2021-06-23 00:34:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 77f78dbaa4d3a83d9d4458d4511e18a2 SHA-1: 8bd79290245f9aa0864c1ce3d2c54ee694776210 SHA-256: e81b8ebcdc764d5ee1f789683af131273abfe00f2fea3a1ef4450b068d34a58a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a lure for game hacks and free Robux, directing users to a suspicious URL. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-rbx-bc-claims-anb-game-hack PDF link annotation
    • http://www.himalassociation.org/himal/ck_image/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-hacks-kostenlos_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-emperor-hack_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-obc-and-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-russian-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-nintendo-switch-digital-code-free_GM479516143.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_off000032c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32C6 22144 bytes
SHA-256: e5222f2b677399c928a082b1ea41135791a28df5e8c1ef945df220afdd8471d0
font_01_sfnt_off000063b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B4 19168 bytes
SHA-256: 8cfa6aeb52740c994e31557ace8031e7c2957dc5cdc375a2150d0e0013fae56c

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