Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c337670abfb6366…

MALICIOUS

PDF

35.5 KB Created: 2021-06-19 04:37:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4d7e2f9b0597c16c6c39ee9c9f080892 SHA-1: 12522038e3398ed9c8c029d80c044f0e25d624c9 SHA-256: 9c337670abfb63661794c683397bcf4f465e337ede1d9699f2f56cf8cf6cc14e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users. It contains multiple links to redirector domains, which in turn host further malicious PDF files, indicating a multi-stage infection chain. The ML classifier strongly flagged this sample as malicious.

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/406889139/coin-master-free-daily-spins-link-game-hack In PDF document text
    • http://www.jureclomas.com.ar/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/free-scpf-site-roblox_GM431946152.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/book-wings-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/hack-de-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/roblox-drivetm-hack_GM431946152.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/roblox-rocitizens-cheat-codes_GM431946152.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://www.jureclomas.com.ar/images/coin-master-free-gift-cards_GM406889139.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_off0000332f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x332F 23020 bytes
SHA-256: da940c04092af16bf6ae06d1b47262f72fa51c517fe85c1bb45ffc16f0eae061
font_01_sfnt_off000066c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C5 18768 bytes
SHA-256: 0ceb7b0488aaa16a0c23cac8de9df794ae3fa7cd27271b33a51c469a71425e8d

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