Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a14c529e96d57b1…

MALICIOUS

PDF

32.9 KB Created: 2021-07-22 15:42:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 71d57310cd7d7bcd31114290ecf7f731 SHA-1: 750adfab237361c8fad687a3c10442c0d5ff30a7 SHA-256: 4a14c529e96d57b1238d365100976ab3edb8e0f69e098b4af518411e2a991252
82 Risk Score

Malware Insights

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

The PDF document contains multiple links and a call-to-action phrase designed to lure users into clicking on a URL associated with 'free Robux' or game hacks. This URL, http://netcdn.tw/app/431946152/get-free-robux-no-human-verification-game-hack, is likely a redirector to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/get-free-robux-no-human-verification-game-hack PDF link annotation
    • http://www.ma-hidayatulinsanpky.online/__statics/gudangsoal/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://www.ma-hidayatulinsanpky.online/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ma-hidayatulinsanpky.online/__statics/gudangsoal/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://ma-hidayatulinsanpky.online/__statics/gudangsoal/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://ma-hidayatulinsanpky.online/__statics/gudangsoal/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-hidayatulinsanpky.online/__statics/gudangsoal/files/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://www.ma-hidayatulinsanpky.online/__statics/gudangsoal/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://www.ma-hidayatulinsanpky.online/__statics/gudangsoal/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://www.ma-hidayatulinsanpky.online/__statics/gudangsoal/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://ma-hidayatulinsanpky.online/__statics/gudangsoal/files/mobihack-net-roblox-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_off00002cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CB7 21612 bytes
SHA-256: 26f38a334e313dca4e8e8c6d671467153eda31f52f92ce419db5830564104396
font_01_sfnt_off00005c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C60 19044 bytes
SHA-256: 38fd224e0d48f9f4e428ac61794e14445b5b8d4d7f08215596fa31319312d533