Malicious PDF — malware analysis report

Static analysis result for SHA-256 073045848b91ffe9…

MALICIOUS

PDF

33.1 KB Created: 2021-07-29 23:38:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5f91b3699c6309d66f20877afae208f7 SHA-1: d8c5cb67425fca68095405dd690454e96e324c0f SHA-256: 073045848b91ffe9ad98762564e4038a0747a74cb322c095bdd163eb524db996
160 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 button designed to lure the user into clicking on a URL that leads to malicious redirector infrastructure. The primary lure is for a 'free generator / game hack' for Minecraft, which redirects to http://netcdn.tw/app/479516143/how-to-get-minecraft-for-free-ios-game-hack. This infrastructure is known to host malicious content, and the document itself was flagged by a machine learning classifier as malicious. No scripts were extracted, but the embedded links and the document's deceptive content strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/479516143/how-to-get-minecraft-for-free-ios-game-hack In PDF document text
    • http://mmech.com/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://mmech.com/images/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://mmech.com/images/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://mmech.com/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://mmech.com/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://mmech.com/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://mmech.com/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://mmech.com/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://mmech.com/images/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • http://mmech.com/images/free-robux-legit_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_off00002e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E0C 22744 bytes
SHA-256: 6a2cb129a53765a9ef3eca5b4390cbff40eee76a68819ef0a0126f04871cf64e
font_01_sfnt_off000060c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60C5 17872 bytes
SHA-256: f310131035db742f338f230ab2c5697c5d59cc25d8943e3e3339342bb09010ba