Malicious PDF — malware analysis report

Static analysis result for SHA-256 837a80d129f5f6d3…

MALICIOUS

PDF

32.4 KB Created: 2021-07-20 09:14:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 47f264b09c51f12c8fa2b531eb399d8c SHA-1: 1152c7773d8b7dc6c746e9c1c342ab38a70184ae SHA-256: 837a80d129f5f6d3fb592e9dfd96e10e2fa5101a9afcef83dd3271d11d3d572d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game items and hacks, directing users to a suspicious URL. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to a phishing or malware download site, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/479516143/minecraft-redeem-code-free-game-hack PDF link annotation
    • https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.harshulayurpharma.com/uploaded_files/userfiles/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://www.harshulayurpharma.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.harshulayurpharma.com/uploaded_files/userfiles/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.harshulayurpharma.com/uploaded_files/userfiles/files/minecraft-free-app_GM479516143.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_off00002ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDB 21572 bytes
SHA-256: 73381a999e7b273fff5a2fa16fab429a79ce0f5123f2c8fbaa36860644fdc4e7
font_01_sfnt_off00005d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D00 18144 bytes
SHA-256: cc19f71067fb84b21b4f81fd44d646587f5653a8a3073e37b17122851b8ee9dd

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