Malicious PDF — malware analysis report

Static analysis result for SHA-256 4832bee8f1b33f2f…

MALICIOUS

PDF

34.6 KB Created: 2021-07-07 03:22:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b3b0e7b747026eaaeffe1da099bd8cdf SHA-1: 88313e26fd7dbb8464b6b07893085cd97668c432 SHA-256: 4832bee8f1b33f2f9d63fafa9e9e900c0017aae2664c4948443e827949d43638
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 http://netcdn.tw/app/431946152/roblox-character-free-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-robux-in-roblox-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/login-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/what-is-the-fastest-way-to-get-xp-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-tshirts-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/mad-city-cheat-codes-season-2-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-rs-in-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/como-hackear-cuentas-de-roblox-con-programas_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-generator-google-chrome-plugin_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-bubbly-animation-free_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-instantly_GM431946152.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_off00003256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3256 21984 bytes
SHA-256: f1de22fed59a9c3345872bc6fbadf9d914ac865618391afb3b4cb7a9b9120140
font_01_sfnt_off000062c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C5 18920 bytes
SHA-256: b5474294296d9f5b9ea12a54036d97a64d26d44eeb49bdd78dad108d1826d115

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