Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb7b6e3f7ab3a01…

MALICIOUS

PDF

50.4 KB Created: 2021-06-03 06:40:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f5e93b7081e22b85badfb369c7017ccd SHA-1: f31cb0fda2d7d428e07f136b376f095623f13b02 SHA-256: 3fb7b6e3f7ab3a01ea2dac2cf4f6deb3214cef8c3bf4ee03d395fcf5caaefebf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting a 'free Robux generator' lure. The presence of multiple links to known malicious redirectors and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/431946152/how-to-get-robux-for-free-2021-game-hack In PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/free-generator_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/pokemon-go-free-coins-without-human-verification_GM1094591345.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://www.en.indigo-imaging.com/Public/upload/editorfiles/how-to-hack-roblox-to-get-free-robux_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
stream_004_off000055bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55BD 26652 bytes
SHA-256: d17b9d65f5d8cb950da3026db3b774566791fd04c878c5f4bf504f71fb0f0f5d
font_01_sfnt_off000093b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B5 5756 bytes
SHA-256: a7a69a356750c58f853193ac64834dcf3e4080fc2a8f6e9107645a696c81e11e
font_02_sfnt_off0000a107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA107 18684 bytes
SHA-256: 65f445f0396e54760dd2a1edc1744209422bc48f29c35ea74a9bcb72e79f8b06

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