Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bea913866c478c8…

MALICIOUS

PDF

33.0 KB Created: 2021-06-28 03:42:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a8667eb29217e915b1fab9b8cf5b32c2 SHA-1: ec19118977c956363d429adad250c8b76729da33 SHA-256: 5bea913866c478c830609b509f79426acf839e9d5be1b93bce0d49516e5d58e1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which are presented as cheats or hacks for games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a tactic to attract users searching for game exploits. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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.co/app/431946152/rhs-money-hacks-roblox-game-hack PDF link annotation
    • https://mbbs.hr/files/hack-para-assassin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/ulgames-resources-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-without-being-scammed_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/descargar-hack-de-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-gravity-hack_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-free-shirts-and-pants-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-in-roblox-fe2_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
stream_001_off00002916.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2916 22716 bytes
SHA-256: db2d5d82b517ea57cc9483e7c5976b9d85cdd7cbd90c874d6d2aafdcc1643df4
font_01_sfnt_off00005ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA1 19196 bytes
SHA-256: 36d97d9dee2729f2ddbc3d1d404fac12eebc5c59d424e49cc46e71f6162eeb50