Malicious PDF — malware analysis report

Static analysis result for SHA-256 a321a7c3c57bfe98…

MALICIOUS

PDF

42.1 KB Created: 2021-05-12 01:19:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ccea5fad1189d4b9a3f117e40d1af714 SHA-1: d6f6a380fa72836970cd90c87e2348f0706178f6 SHA-256: a321a7c3c57bfe98d1856efdaeef98d420ad33737f7f967eea01c32a811198c2
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 0.9971

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.xyz/app/479516143/how-to-make-a-server-in-minecraft-java-for-free-game-hack PDF link annotation
    • http://www.torvet11.dk/images/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://www.torvet11.dk/images/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://www.torvet11.dk/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://www.torvet11.dk/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.torvet11.dk/images/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.torvet11.dk/images/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.torvet11.dk/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.torvet11.dk/images/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://www.torvet11.dk/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://www.torvet11.dk/images/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • https://code.giftcards.comIn 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_003_off00004a74.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A74 24536 bytes
SHA-256: 20c2d9efbbaab241a347219e5af1500e1be68dea03f81090aebd38d82126aafa
font_01_sfnt_off00008249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8249 18324 bytes
SHA-256: 9279d0b6186d29dee92c92ea41ad607c96b6d67fd8c4a148fb7dbd95f22d9888

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