Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ba4e38813e5f83…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 10:39:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 63713eb5d6c032f44b6539723a66a6e2 SHA-1: 0c64e3f7328279d5bf41e9f9366b51187728362d SHA-256: f4ba4e38813e5f83032d760500d3af19ee73d74beea5de26db638ced1d3de26a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body, though partially corrupted, contains text related to obtaining free Robux and a URL pointing to the malicious redirector. No scripts were extracted, but the presence of malicious links and the lure suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/codes-to-get-free-robux-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/tiktok-free-to-download_GM835599320.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/www-robux-com_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-18_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-setup-a-minecraft-server-for-free_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_off00004e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E24 25680 bytes
SHA-256: 2e136dad0bd9648493deab19e38fd03018c111314bc9e8429de6d03f0cbd1005
font_01_sfnt_off00008973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8973 18292 bytes
SHA-256: c4e16f213ba515826b0fc8bd2adb9a42249615e2a7fe5232f5ebe2d4ec6172c1

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