Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a09ef26ad914cc4…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 14:13:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d7a73fef2ab8e1d073807bd783fa87d3 SHA-1: 58c78d1577e7d9b01cd67aaf8fb02f6cec308ca2 SHA-256: 5a09ef26ad914cc44efecf06e8ba5bed75f5922ff8d4d9404ccd53bf1ea8c49b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'free Robux' and game hacks to entice users. It contains an embedded URL, http://netcdn.tw/app/431946152/free-robux-by-watching-ads-game-hack, which is likely a redirector to a malicious payload or phishing page. The ML classifier strongly flagged this PDF as malicious, supporting the observed lure and URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-by-watching-ads-game-hack PDF link annotation
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/is-tiktok-free-to-download-on-iphone_GM835599320.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/how-to-get-free-hair-extensions-on-roblox_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/roblox-skin-free_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/roblox-dance-hack_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/infinite-robux-hack-2021-script_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-download-roblox-for-android-phone_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/roblox-legit-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/roblox-boxing-simulator-2-hack_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_off000031cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CF 22084 bytes
SHA-256: 027e9617d1e19006e7b431a50977023cb4d3625c5e3f40dbb4bf1ba2da66e285
font_01_sfnt_off000062a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A3 19660 bytes
SHA-256: f0cdf6166c464805662a9cde01402bcc449eb6222422d9d5af766ad530424c87

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