Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a894707b44b58a…

MALICIOUS

PDF

44.6 KB Created: 2021-06-13 16:57:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 512115b566c19ec571305e0bc010eee1 SHA-1: 8f512e5429aa4bb8b1915369a1ee822149c178f0 SHA-256: 52a894707b44b58a993848996a7b633fed8c84a3f86e58f32ed785ded8365e76
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 0.9865

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 http://netcdn.co/app/431946152/titanic-roblox-cheat-game-hack PDF link annotation
    • http://www.fluidtech.hu/images/games-you-can-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/coin-master-hack-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/hacks-for-roblox-assassin-auto-aiming_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/hack-para-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-robux-and-tix-cheat_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-robux-servery_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-any-aduio-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/como-hackear-el-juego-coin-master-en-espaol_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_off00004db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB4 27508 bytes
SHA-256: 425cf067e5b72e1c8db16cdabd115795b96bb2d28c5dade363d95afa88ece134
font_01_sfnt_off00008b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6D 18404 bytes
SHA-256: c59fefd1e3de0e183acebd53329a88fa06902a840cb8ac084f393ca1dbadc718