Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4b4a6c16b0b351…

MALICIOUS

PDF

42.9 KB Created: 2021-05-17 09:12:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d05d99ed2ac0317e20de03fa780997de SHA-1: 0f220797850e2fbf4a5b6c6b83eb949ae8532221 SHA-256: 9c4b4a6c16b0b351009599ddca9b247ce40d68f195f9ce3adca82df842eab5fe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that point to known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.xyz/app/479516143/free-minecraft-account-and-password-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow designed to trick users into visiting potentially harmful sites.

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 https://netcdn.xyz/app/479516143/free-minecraft-account-and-password-2021-game-hack In PDF document text
    • http://www.sfakia-online.com/images/free-coin-master-s_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/wurst-112_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://www.sfakia-online.com/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/www-rubux_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://www.sfakia-online.com/images/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sfakia-online.com/images/free-robux-codes-no-verification_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
stream_003_off00004af6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF6 25032 bytes
SHA-256: 395b96ca9c76aac0cd685bf367ef50bc013e04558ac9b7f513cfd6be3b194a79
font_01_sfnt_off00008415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8415 18744 bytes
SHA-256: 32e597d278032ff7c82e1179504235c91567bf80b74fa8ae34959daeb6a42353

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