Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c495e321d3780b…

MALICIOUS

PDF

34.9 KB Created: 2021-07-09 20:24:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ec0b61803d535bb11efa0862971a200e SHA-1: 6aa8e281a0c616687013470eedc3f17564729da3 SHA-256: b1c495e321d3780bc9f1f9db5e6d470fdd0e68878efba4cb736917c846d591a3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-hack-2021-game-hack, which is associated with malicious redirector infrastructure. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites.

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/406889139/coin-master-hack-2021-game-hack In PDF document text
    • https://topkoreamart.com/public/upload/files/roblox-escape-school-online-free_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/roblox-hack-cleints_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/roblox-mm2-hack-knives-script_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/robux-win_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/roblox-verification_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/how-to-get-800-robux-for-free-nov-2021_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/roblox-prison-life-noclip-hack_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://topkoreamart.com/public/upload/files/latest-free-spin-coin-master-daily_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
stream_002_off00003163.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3163 23024 bytes
SHA-256: 490da3a6dd1bc185678b35114d2efd493efe1253b0ad495d05563f1bd3c6cba6
font_01_sfnt_off00006544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6544 18408 bytes
SHA-256: 8438728008f6ab05b5c9a65d4eeb1f2e5c23a436eadc11c6e76328f72b7d7fb7

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