Malicious PDF — malware analysis report

Static analysis result for SHA-256 350dab82f3fd6c5f…

MALICIOUS

PDF

34.7 KB Created: 2021-06-30 04:37:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5c8d564e11384ce3819d08480bb7f820 SHA-1: 094bfaae1a37a6069381e4b3fcef4ea95c4ba92c SHA-256: 350dab82f3fd6c5f6c980ccfda0365692fa83145a55a21b1e8efb96a4673b369
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on domains associated with link farms and malicious redirectors. The document body and extracted URLs suggest a lure for free in-game currency or cheats, a common tactic for phishing or malware distribution. The ML classifier and critical heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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
  • 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/free-robux-now.com-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-just-put-in-your-password_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-i-get-bloxburg-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-roblox-promo-codes-july-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/como-descargar-hacks-para-atravesar-paredes-en-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-inspect-consle-hacks_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-twisted-murderer-hack-nopde-engine_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/est-il-facile-de-hack-sur-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/www-robux-hacker-co_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.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_off00003047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3047 22396 bytes
SHA-256: abe96a8c05ac7e641862792cea6caaab1b37523157f30c847a6cd687f08933f8
font_01_sfnt_off00006243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6243 19204 bytes
SHA-256: 8aa0ac12f92da39c2060543af6ba42708f7a699c53cd65020a7c8740e7a0660f

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