Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc5579f9534d988…

MALICIOUS

PDF

42.7 KB Created: 2021-06-13 22:54:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7b2d627efaa207c1e6422c3e2c27b9bb SHA-1: bf6633eae31b38c95691c5b0c21bca45485fe46f SHA-256: edc5579f9534d9885d11953f4cc69a91ef605e4593991e7019e687e5cedb3a81
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The document body and embedded URLs strongly suggest a social engineering lure to trick users into visiting potentially harmful websites. The presence of redirector links indicates an attempt to obscure the final malicious destination and potentially deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.co/app/431946152/how-to-get-free-robux-website-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/roblox-re_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-stuff-for-avatar_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coins-coin-master-2021_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_003_off00004909.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4909 25192 bytes
SHA-256: 8e6139f8f5f449d10972c0acbe78bf46a173e4f08bceaaa87864afc5b9f92d56
font_01_sfnt_off0000834b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x834B 18600 bytes
SHA-256: ac0d4502235c23175446595a7cf8e817a77a023a22f0524dfc344b6b051bbd29

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