Malicious PDF — malware analysis report

Static analysis result for SHA-256 121feaeea206c213…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 17:01:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 945b79bc52e48e9568382fd33a903988 SHA-1: 539133c9515d02f6a51ea9752579f83b7c342659 SHA-256: 121feaeea206c213ac532ae781b3c1372f6106fd72aefeb1808b4068c5e862f6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body also contains this URL, reinforcing the lure. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves tricking the user into clicking a malicious link, likely leading to further malware download or credential harvesting.

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.tw/app/431946152/how-to-get-free-robux-codes-game-hack In PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-game-hacks_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-hack-money-on-any-roblox-game_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.uf.ac.id/opac/repository/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off000032f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32F9 22520 bytes
SHA-256: 8551a7b493a6bc808109d0d2ddf73d0adf47b3ddf5445800ec22700753e8244b
font_01_sfnt_off0000651e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651E 19156 bytes
SHA-256: d834416b7e9185468f589fe40c9632ebbdbdfe97c28f85986fef52e4c0b1d557

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