Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4c10651d936780…

MALICIOUS

PDF

44.5 KB Created: 2021-05-11 04:31:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d83f04d7c7f1d581e80712d7eba3a7dc SHA-1: 206128df1d94123b209bd30ac706380d902687bd SHA-256: da4c10651d936780c27dc885f931f36e6a56e61f5a6bb1bd0ff4b9ba5f97f5ec
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/coin-master-2021-free-spins-link-blogspot-game-hack PDF link annotation
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/dailyrobux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/robux-now_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-robux-without-verification-2021_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_003_off00004b50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B50 29308 bytes
SHA-256: 3258cee5ca7bbbb352cbe32297ab98e09e09c1df18d8fa20bd4e404b95b7f03c
font_01_sfnt_off00008965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8965 19036 bytes
SHA-256: 29484b4ebf3793c9706388e12a4eb2d5c1ba7d7e7655f6e92dea7caed4d0fe01

Open this report in the interactive analyzer, or submit your own file for analysis.