Malicious PDF — malware analysis report

Static analysis result for SHA-256 0544ec1f6aab6b69…

MALICIOUS

PDF

43.7 KB Created: 2021-06-13 22:25:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f9ab77d5173d52f7599c4993805bba86 SHA-1: 37b9fbc6d9732ac5dbcedd7db99e3712221a0b82 SHA-256: 0544ec1f6aab6b69b5359bbd3fe25b80a43dd1d623837dd4d4d2102b4456ee56
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and a call-to-action lure related to obtaining free game currency, specifically 'Robux'. These links redirect to a known malicious infrastructure. The document body, though partially corrupted, also contains references to 'free Robux' and a URL that matches the malicious redirector. This suggests the primary purpose is to lure users into clicking malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/how-to-get-free-robux-no-human-verification-2021-2021-game-hack In PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/how-to-get-free-robux-lohith-gaming_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/free-roblox-acc_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/can-you-change-your-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • https://e-learning-ma-nurussaadah.com/__statics/gudangsoal/files/tiktok-fans-free_GM835599320.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_003_off00004d4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D4A 24392 bytes
SHA-256: ef184dadfb6e47639a35bfa26453e535b2b04a0d6ef265c326e121c7df753bae
font_01_sfnt_off000084ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84EA 19460 bytes
SHA-256: ea9369baaa36ed57f49217851f52ff6a815f17a7538fe6dff924f30229c7a68f

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