Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1adc3c430b3c24…

MALICIOUS

PDF

42.8 KB Created: 2021-05-11 03:36:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8d48bc26bead08e2e2ec449d308bbdd7 SHA-1: f22347ba94903eee9c0f8012ac1f8c673a10dde0 SHA-256: 7d1adc3c430b3c2497905bbaaaa8f76c564ca2150acf4183b68caaf3f6aca2e3
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links to known malicious redirector infrastructure, specifically offering free Robux or game hacks. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of malicious links and the lure of free in-game currency strongly suggest an attempt to trick users into downloading malware or visiting further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 3

  • 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/431946152/huskybus.com-free-robux-game-hack In PDF document text
    • http://www.centromedicinasport.com/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://www.centromedicinasport.com/images/coin-master-hack-2021-no-human-verification_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_off000049cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49CF 25592 bytes
SHA-256: 6676bd317640baccd6be34f693d3fa9379de8c50b849008f4f8acff19aa14d65
font_01_sfnt_off000083bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BB 18688 bytes
SHA-256: 6add98f93d6464e4673e157e466f8eac90a499b9ef5784f234ada041ea0169f0

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