Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcd616bb870c6c2…

MALICIOUS

PDF

44.6 KB Created: 2021-05-12 16:34:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5809196c5d17d8360c9c121b95e64fc9 SHA-1: 1fa4732863cc606426c43e70f00dcd201d82071c SHA-256: 2fcd616bb870c6c272c1b433830705314437fadf692c1fad6b0dafdac970094e
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/431946152/how-to-earn-robux-for-free-2021-game-hack PDF link annotation
    • https://ponturipariuri.pro/ckfinder/userfiles/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/hack-minecraft_GM479516143.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/mcpe-optifine_GM479516143.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/roblox-system_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/coin-master-hack-pc-2021_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ponturipariuri.pro/ckfinder/userfiles/files/spin-and-coin-link_GM406889139.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B52 27904 bytes
SHA-256: f62796cbdf66c69d440de7d3a2aadc085128bcee2a6d1231f281a87bab133819
font_01_sfnt_off00008a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A80 18808 bytes
SHA-256: 177d88bc60daff4309aceb58336b2ba1d1983158bcd2aa353c0aa46f075a8142

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