Malicious PDF — malware analysis report

Static analysis result for SHA-256 21720ba828b5ee2e…

MALICIOUS

PDF

34.4 KB Created: 2021-07-24 23:58:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a9dc056b866e4fd2360b2229fdb00f54 SHA-1: 493793573dacb061d108d15f044d2eed0a86baca SHA-256: 21720ba828b5ee2ed86883203c7ea400febb429df4a9d06458ee9df7e7bf35d2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9294

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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 http://netcdn.tw/app/479516143/free-minecraft-servers-to-join-game-hack PDF link annotation
    • https://meltonschool.org/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://meltonschool.org/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://meltonschool.org/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://meltonschool.org/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://meltonschool.org/images/free-tiktok-views_GM835599320.pdfIn PDF document text
    • https://meltonschool.org/images/how-to-get-minecraft-for-free-on-pc_GM479516143.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
font_00_sfnt_off00002bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BEC 21588 bytes
SHA-256: da7c33719c6eb53a295f1f84fad082f6250f8719dac5db14652724713d906552
font_01_sfnt_off00005b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B50 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off000064f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F0 17992 bytes
SHA-256: f4dddb1eb99788babbc28e2933b16aea696a65c0930c8e69ff3f00d50dcb50ca

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