Malicious PDF — malware analysis report

Static analysis result for SHA-256 9989d39711a72c91…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 08:49:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ebd90b37a1b6836cd2dca6886afff089 SHA-1: cd657e8ad636dd0ce841bb84da0814f3a8940a53 SHA-256: 9989d39711a72c91295275287efa1e1cce3a844cab7f955a6821bd797c0f9c4f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically promoting 'free Robux' and game hacks. The primary malicious link identified is https://netcdn.online/app/431946152/easy-way-to-get-free-robux-game-hack, which is flagged as a known malicious redirector. The document body and embedded URLs suggest a social engineering tactic to lure users to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/easy-way-to-get-free-robux-game-hack In PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-free-spin_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-face-roblox_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-free-spin-and-coins-links-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
font_00_sfnt_off00004ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA9 26544 bytes
SHA-256: 32e03b3f460623310a9863237abff52245363ca4e06a0bfe8661a7de4eeec89c
font_01_sfnt_off00008aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEA 18724 bytes
SHA-256: ff2b5f5648817baecf5754646eae61914eefadf3856a555e8e6cbc13d6b08405

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