Malicious PDF — malware analysis report

Static analysis result for SHA-256 406fabbc9b44f18f…

MALICIOUS

PDF

33.3 KB Created: 2021-07-06 03:57:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fc26552ad7e0345879321c72540ba971 SHA-1: 1e48b6f48c84fea951da330152fdf7a8311195f4 SHA-256: 406fabbc9b44f18f1b4d76d7a6f49da9cdf628c5a05169ea493f9c0a1079029f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are SEO-optimized and point to game hack generators and free Robux lures. The primary URL, http://netcdn.tw/app/431946152/free-robux-not-a-scam-game-hack, is flagged as a redirector. This suggests the document is designed to lead users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-not-a-scam-game-hack PDF link annotation
    • http://library.itekes-bali.ac.id/repository/roblox-phantom-forces-hack-money_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-how-to-get-without-glitch-or-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-999billion-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/cheat-to-get-the-code-for-dreamkite-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-code-jpg_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hack-2021-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-free-download-for-pc-windows-7_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-asssassin-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-fucking-get-free-robux-2021-real-omg_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-booga-booga-hacks-no-script-needed_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-free-download-ps-vita_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_off00002d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D9C 21616 bytes
SHA-256: ff18a41c1376cca235ed4261401286a0fe8dd33bff2f6c003f8488cb5ca3d17b
font_01_sfnt_off00005d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D17 19080 bytes
SHA-256: 14e01471e6a07db1a68c511ee00ed8ed146bd69de2dd1952b6465b95f794ce32

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