Malicious PDF — malware analysis report

Static analysis result for SHA-256 775f34b82ec08853…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 07:11:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fe27022f2ec351c2ac11e1569313e0eb SHA-1: d78b0d718b0e446118d0ea75f04f0315cb7d67f5 SHA-256: 775f34b82ec088531709c88bde6ec6d4a2ed75a20cd65adfdb61ff8ea3a29b77
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 0.9832

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.online/app/431946152/rbx-website-game-hack PDF link annotation
    • http://pustaka-smpn3tpi.com//repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-free-robux-without-paying_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_004_off00004de0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DE0 32148 bytes
SHA-256: 4a7e4ecf448487f39d38ca531e08e5aef06f87a80a937e0c1da760a898601436
font_01_sfnt_off000097c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97C3 17988 bytes
SHA-256: bc0dd22a51e0bfdba65e2d9b03a977bfdec689b5f568798d86fd7f99b01c2070

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