Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2d7bc88f7a1b6f…

MALICIOUS

PDF

42.6 KB Created: 2021-05-17 05:21:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d53e60859ea2265d96727feb60ad18c8 SHA-1: e0f23eed5b0c1ad0c710631e3e43a81d413f994b SHA-256: 8f2d7bc88f7a1b6f140f175538ade488536360a88cd5f394cdfc7abaaa2a7ec6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, which in turn points to a URL offering "robux game hack". This suggests a lure to download potentially malicious content or steal credentials. The ML classifier also strongly flagged this PDF as malicious.

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/cpbild.co-robux-game-hack In PDF document text
    • http://yochin.org.tw/images/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/robux-gainer_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins-cheat_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_off0000461d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x461D 26768 bytes
SHA-256: 24e88dadb7b1721bc36e854fdbf22a8ea8b134c66b481c69eb682bda78cb6ac6
font_01_sfnt_off0000839a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839A 18460 bytes
SHA-256: 99048da186b71c9dfc5fc272bc085340ca0662c1721045875ee4c725f3f8eda0

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