Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c9b19dd5d3bb0b…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 04:53:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 84811ed5db3c145b7431c530cfe098cc SHA-1: 83a2f5715f1f1d312ba698b337de0d34f9cc1ef9 SHA-256: 82c9b19dd5d3bb0b84ce4e4af4ce77531387e2d36ba18372bddc3a2a55a82d34
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically promoting 'free generator / game hack' lures. The primary URL identified is https://netcdn.online/app/406889139/40-free-spins-coin-master-game-hack, which is associated with malicious redirector activity. The document body, though partially corrupted, contains references to this URL and other similar PDF download links, suggesting a phishing or scam campaign aimed at tricking users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/406889139/40-free-spins-coin-master-game-hack In PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/free-robux-com_GM431946152.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/what-is-a-robux_GM431946152.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/free-robux-android_GM431946152.pdfIn PDF document text
    • http://ginfed.net.co/editor_rc/tools/ckeditor/img/images/files/free-robux-generator-no-survey_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
stream_004_off0000522a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522A 29316 bytes
SHA-256: 9593167457145f51fe2aeae88b6949a92bc01c869e19927a67c9c20fc911fc7b
font_01_sfnt_off000093f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93F1 18120 bytes
SHA-256: adc3b494d1fa0974f6acdf3c8a88f4cec1eca3c3c07b4c24b7a089c53791e33f

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