Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c8ac58514a1c0e…

MALICIOUS

PDF

48.4 KB Created: 2021-06-07 12:35:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c76012a176f7c45a83dfb59d18a6e634 SHA-1: affb70ca60248496c66f2b32bcf22307ba7a98c8 SHA-256: 51c8ac58514a1c0e0028a273c977a795591427ffb3f3135667f1979f9a4fac54
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake browser/software-install lure. 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 0.9796

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.tw/app/431946152/get-everything-free-on-roblox-game-hack PDF link annotation
    • http://www.makoto.su/images/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://www.makoto.su/images/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.makoto.su/images/roblox-download-for-free-pc_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/how-to-get-free-stuff-in-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.makoto.su/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.makoto.su/images/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bandicam.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5051 26172 bytes
SHA-256: 7da3e83a93f4561ed468df91c2ced6e770b9797e817010806e024e6479772161
font_01_sfnt_off00008bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF6 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000989e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x989E 18920 bytes
SHA-256: a2bf5e85f983ce8329b09587c1eec78f60d575f6ca1672253e3386aa93c3f1e0

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