Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d3c36e64fa3fc1…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 22:18:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b6805212cd218afd873b4094e3634d6c SHA-1: 23784bef3545e59218292fe126d9a8469608cf5c SHA-256: a4d3c36e64fa3fc1baf10fc2cd3f9822871cc5fc55fcdd7582ddd790dff8557b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/cute-free-stuff-on-roblox-game-hack PDF link annotation
    • http://opac.acehresearch.org/repository/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://opac.acehresearch.org/repository/to-get-free-robux_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
stream_004_off00004eba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EBA 25548 bytes
SHA-256: 1a1c1f44ad747307159088c4fe3e689c7f4d6b01c028323d6c998d465f1157c2
font_01_sfnt_off00008907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8907 18192 bytes
SHA-256: a6b915e7016f468889ed3b93934f8cc43e4d030a5546ddc8b69dc33b37ef3c58

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