Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ae4ba589029bf2…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 22:04:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fbdea90b6b58f3ff8104fed078065902 SHA-1: 5eee8795492d4014fdc4dc6635f6a1b38c7f8d4b SHA-256: 63ae4ba589029bf2ca13f47d0144f7f429812e05f1662a7dd57c95d769654c70
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are structured as a link farm for SEO purposes, likely to distribute malware or facilitate scams. The primary lure appears to be 'free Robux' or game hacks, a common social engineering tactic. The PDF_SEO_LINK_FARM heuristic and the high number of extracted URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/free-robux-obby-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/100-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/hack-avatar_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBB 26956 bytes
SHA-256: 1fd3f63816d638ae94fc85ba51347ea1cc773aebbdba8b200a88aaf09d87187c
font_01_sfnt_off00008b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5C 18196 bytes
SHA-256: adb317c4997580e24d4ed6f1d3168dfe6823b431b7b24dbbc6245ab95f909cf9

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