Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfb9a65cdf64892…

MALICIOUS

PDF

33.1 KB Created: 2021-07-06 06:10:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5ba97c0b7f75e664b162d56774857b04 SHA-1: 06504af8f53d0121cccc2224584c745d7095675e SHA-256: ecfb9a65cdf64892d6c61b03520d07a4351f3c2fe286c2864b2e387af1007223
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and generators. The primary lure URL is http://netcdn.tw/app/479516143/minecraft-hacks-wurst-game-hack, which is flagged as malicious. The document body and heuristics confirm the intent to trick users into visiting these sites, likely for further malware delivery or phishing.

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-hacks-wurst-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/free-tiktok-engagement-calculator_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-net_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-someone-on-roblox_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_off00002ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED0 21756 bytes
SHA-256: 2035dcf2954caf9963ebd100085392583c2e4c5859a8c99d13b5461ad34eff7e
font_01_sfnt_off00005e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E77 18364 bytes
SHA-256: 521d9e21ddb37bcf50fca8719f17a590544ab37de3ab7ae08bd463770fa05be1

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