Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1c10d1d86865be…

MALICIOUS

PDF

42.3 KB Created: 2021-05-19 01:38:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ad5a9b78fe5d7133d2299c54082534ec SHA-1: ac7f28bd2f966bbee72ff29821c7bc4ae5f4bbdb SHA-256: ba1c10d1d86865be5dd69cfa17cafeb13bc7c0d53e8915545495a86cd7119ad1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering free game items and accounts, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the 'PDF_GAME_HACK_REDIRECT_LURE' specifically points to a redirector for game hacks. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://netcdn.xyz/app/479516143/free-minecraft-java-edition-account-game-hack PDF link annotation
    • http://opac.stiesa.ac.id/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/roblox-rules_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.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_off00004a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A37 25344 bytes
SHA-256: eaf8e3538b50761fa97f67a1ef79e300346b0df77c7a8d9e73b6ed25b0a3a408
font_01_sfnt_off00008322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8322 18304 bytes
SHA-256: fdb32e200e3f48b15bca95ad0d9adda07d4e6a4b6e210c555ad24f5d4abffe5e

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