Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d01f25788ad272…

MALICIOUS

PDF

42.2 KB Created: 2021-05-15 06:40:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f686fda588df295ec1adbf30d1c0d141 SHA-1: 0bd2f2620b3052a2a17cf56816b9bdef22fc8f20 SHA-256: d4d01f25788ad272d5fc15c1d2cbf5aae37d1dd16f06d6e563f4a1edb231c06d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spamming operation. One embedded URI, 'https://netcdn.xyz/app/406889139/daily-spins-coin-master-game-hack', is also present. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a potential attempt to direct users to malicious or unwanted content. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/daily-spins-coin-master-game-hack PDF link annotation
    • http://www.learningbydoinglingue.com/images/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/robux-claimer_GM431946152.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/coin-master-ios-hack-download_GM406889139.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/roblox-verification_GM431946152.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://www.learningbydoinglingue.com/images/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn 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_off00004a62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A62 24536 bytes
SHA-256: c8c52bd52a6f336e1a7104adfb4f05f41dda5d406811dbc8bf10bd132ecb912e
font_01_sfnt_off000082e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E4 18144 bytes
SHA-256: 1262f4d4cd034a4c9562a277dbba73095a6416475eb754b173a4e193cc6b3510

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