Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b731a855f7d10c…

MALICIOUS

PDF

42.4 KB Created: 2021-05-16 16:39:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7d766c88d32fe8cf2c81429378158002 SHA-1: 81189ba68a46b7fb224975526aed32527d624396 SHA-256: a8b731a855f7d10c91297d1ff524fb041424839efeb1a359240ce3bef17859a8
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/free-robux-no-human-verification-or-survey-game-hack PDF link annotation
    • http://medimacs.eu/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://medimacs.eu/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://medimacs.eu/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://medimacs.eu/images/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://medimacs.eu/images/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://medimacs.eu/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://medimacs.eu/images/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://medimacs.eu/images/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • http://medimacs.eu/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://medimacs.eu/images/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://medimacs.eu/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://medimacs.eu/images/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • http://medimacs.eu/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://medimacs.eu/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://medimacs.eu/images/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://medimacs.eu/images/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://medimacs.eu/images/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://medimacs.eu/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://medimacs.eu/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://medimacs.eu/images/how-can-i-get-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
font_00_sfnt_off00004946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4946 25104 bytes
SHA-256: 2e03ccc0a12b5c344e70778871b8f53a9e7717f2c9f3b25e64571dd47819c833
font_01_sfnt_off000080e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E0 19156 bytes
SHA-256: 67fe8f54727a48f1cd96414783693fce3a40c8eaba0da55a0542d393d9c1d7aa

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