Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1bc143fbb7edb1b…

MALICIOUS

PDF

32.5 KB Created: 2021-07-19 02:38:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 15bcf7f349a9a421b1426ee83a0827b0 SHA-1: e22516bc568509f5da9b5353f142cf6fcbd88bbf SHA-256: e1bc143fbb7edb1bb5d252e30e35594deb6189efe4e4c37a4d9ceb4b78eccb02
82 Risk Score

Malware Insights

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

The PDF document uses a "free Robux generator" lure to entice users to click on a link. This link, http://netcdn.tw/app/431946152/free-robux-hack-2021-game-hack, redirects to a site that likely serves a malicious payload. The ML classifier strongly indicated maliciousness, and the PDF structure and content align with social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://netcdn.tw/app/431946152/free-robux-hack-2021-game-hack PDF link annotation
    • https://www.romedia.gr/images/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • https://www.romedia.gr/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.romedia.gr/images/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://www.romedia.gr/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://www.romedia.gr/images/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://www.romedia.gr/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://www.romedia.gr/images/how-to-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://www.romedia.gr/images/minecraft-pe-hack-client_GM479516143.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_off00002792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2792 22784 bytes
SHA-256: ed60e90e0f659b891758f808abeb437677074d28e08880a53442172a914abbdd
font_01_sfnt_off00005ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE5 19000 bytes
SHA-256: 50568fc7a8142eae64dd61285c1f793be6192b112dcc14b27c629c71df451875

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