Malicious PDF — malware analysis report

Static analysis result for SHA-256 8148c86f51b53fbf…

MALICIOUS

PDF

34.2 KB Created: 2021-07-01 13:36:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a18f7557956389e2ec946e939ee428aa SHA-1: 502031b7916524ab98540d0d9f51e08bad1b1f42 SHA-256: 8148c86f51b53fbf7f51a3aa7fe2e3762b8b51e074d908723bd964705e13ab36
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains multiple links to a known malicious redirector, masquerading as a lure for game hacks and free items. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a download button lure indicate a phishing or scam attempt. The primary malicious URL identified is http://netcdn.co/app/431946152/cool-free-green-shirts-roblox-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/cool-free-green-shirts-roblox-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/urbx-club-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-roblox-robux-genarator-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-free-download-for-tablet_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-names_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/mcpe-116_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-redeem-codes-generator_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-compagnon-roblox-generator_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-plane-models_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_off00002f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3D 22300 bytes
SHA-256: 26be962c07f66960cca2b50b4155f7c52f53a70d320089c626f13aa3a69e2f1a
font_01_sfnt_off000060d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60D0 19040 bytes
SHA-256: d35dddcf98004229fc8b61d2d42b7e275aa42273530d965f6e02039bc6666661

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