Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ddb7ce001711be…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 06:03:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 51b4684f877a18c095824d9c5d83d35e SHA-1: 0a36a10f3dcc651a9b685f6c432f2ffb64198248 SHA-256: b1ddb7ce001711beba699401282c57cc2470c6946b1530c9643a3143fabb2747
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generators" or "game hacks" for popular games. The primary redirector URL is http://netcdn.tw/app/479516143/minecraft-java-edition-free-game-hack. This indicates a lure to trick users into visiting malicious sites, likely for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/479516143/minecraft-java-edition-free-game-hack In PDF document text
    • http://www.businessgalaxy.lk/files/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/how-to-hack-roblox-ninja-assassin_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/noob-invasion-roblox-get-free-kills_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/hack-how-to-get-oakley-roblox_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/pokemon-go-windows-free-download_GM1094591345.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/roblox-whatever-floats-your-boat-hack_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/good-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/hack-para-scp-site-61-roblox_GM431946152.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.businessgalaxy.lk/files/files/free-roblox-promo-codes-august-2021_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
font_00_sfnt_off00003239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3239 22120 bytes
SHA-256: 4f46076a6ce4cfd9fee522699e8c444c3db54578570df6ba4da94d05189d3b26
font_01_sfnt_off000062b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B8 18452 bytes
SHA-256: c88fc963111c99bd76411e48cc5f7a93ca1ac40d038cb8251833f774ecd296b3

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