Malicious PDF — malware analysis report

Static analysis result for SHA-256 c723f21fba1fc746…

MALICIOUS

PDF

39.9 KB Created: 2021-05-21 10:11:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6c9df7eb11823857892e60279e43f6c2 SHA-1: 5fcab44b7849d37bcd3c5830cdec486f3a9c447f SHA-256: c723f21fba1fc746f32e553367ed67c598f2721670a95a396621e4123d2d98c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures related to game hacks and generators, such as 'Roblox Script Executor Free'. These links direct users to external websites that likely host further malicious content or facilitate the download of unwanted software. The presence of these malicious links and the ML classifier's flagging strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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 https://netcdn.xyz/app/431946152/roblox-script-executor-free-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/tiktok-unlimited-free-trials_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DA 26856 bytes
SHA-256: 6039c5ac197a6ce1c6404f1e5c9cd9861939722e4e569a8f4d681b456fae9c72
font_01_sfnt_off00007006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7006 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00007a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A15 18488 bytes
SHA-256: 6ea6bb0236530492a5726fbff6dc4038301159956e914e548a210a1fa14d9cf2

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