Malicious PDF — malware analysis report

Static analysis result for SHA-256 92523a1e1c0860da…

MALICIOUS

PDF

35.7 KB Created: 2021-06-28 15:26:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 21b0f7fc4a69979fda18b66dd9817761 SHA-1: 55dd4e2a5793d2e16d48c61a83c2f88a5eabda23 SHA-256: 92523a1e1c0860da295d45ee193e467c3d7dc82ddec0bee2fd3da84ccef3860f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are presented as 'hacks' or 'cheats' for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm designed to attract users seeking illicit software. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the content strongly suggest a malicious intent to redirect users to download potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/roblox-hack-download-android-game-hack PDF link annotation
    • https://www.ferraroni.net/public/risorse/ck/files/spero-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/pokemon-go-gameplay-free-online_GM1094591345.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/pokemon-go-free-joystick-ios_GM1094591345.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/get-any-roblox-items-for-free-with-inspect-element_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/easy-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/android-robux-hack-download_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/como-tener-robux-gratis-facil-y-rapido-sin-hack_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ferraroni.net/public/risorse/ck/files/free-unlimited-robux-and-tix_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_off000032e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E6 22724 bytes
SHA-256: c158f5314afbf853992448dadd968da28a5080d4d4b770fa62e16d85bb1fff23
font_01_sfnt_off000065d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D8 19284 bytes
SHA-256: a1b18512ff3f748d890a7cd058d456cf2cde555591a14aec9db28d0a5488e49e