Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb82a1dd06da1a0…

MALICIOUS

PDF

44.5 KB Created: 2021-06-08 18:56:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b9a0f58ffbb2b7659d1c9641642d1c95 SHA-1: 8b8fa47d5d1df3f25223458cedf5123a279694fa SHA-256: 5eb82a1dd06da1a002009d472a63b63391664c2e8af4486f1b9726bb133987ed
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO link farms for game-related 'hacks' and 'generators'. The primary lure appears to be related to 'Robux' and 'Coin Master', suggesting a phishing or scam attempt. The presence of a PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links designed to manipulate search engine results or drive traffic to potentially malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/how-to-hack-in-robux-in-game-cheat-game-hack PDF link annotation
    • http://yogaschooldecypres.be/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/best-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/buxblast-free-robux_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • http://yogaschooldecypres.be/images/free-robux-that-actually-works-2021_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_off00005017.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5017 25200 bytes
SHA-256: db5e4d9d5448d6c7b0fa50af60c3e26895987271d2f5def62c27598e9e3294a8
font_01_sfnt_off00008989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8989 18944 bytes
SHA-256: 446cfd36f53cad37d393f153db709057638f26509034c08add743624ef04c0c5

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