Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd21910b4972e154…

MALICIOUS

PDF

46.0 KB Created: 2021-05-11 06:08:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5a09117a3a451a3ae83565febf6d46c8 SHA-1: 3a596cc24e126f7b29d516cc2c5e37c873223cf3 SHA-256: cd21910b4972e154bfeb559d9d4f01662d68cd75f31be593981cf953ca9e129d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded links to external websites, one of which is identified as a malicious redirector. The document body also contains text and links related to downloading applications, suggesting a lure to trick users into downloading malware. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/406889139/coin-master-3.3.2-apk-free-download-game-hack In PDF document text
    • http://yochin.org.tw/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/no-human-verification_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/picture-roblox_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bf9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF9 25312 bytes
SHA-256: 874640e093ecbd35fe89a09660a75ec80c1d0557dc59b3451feab6fd07c2982e
font_01_sfnt_off0000857d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x857D 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2F 19000 bytes
SHA-256: 784b1e1b1d240dab4fb966bf2beaa9dcc272aea1979d30251c3bbe87cc6a5b4c

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