Malicious PDF — malware analysis report

Static analysis result for SHA-256 99df1b98a2fed4a3…

MALICIOUS

PDF

44.5 KB Created: 2021-05-17 13:05:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1ab352df25f8686b6c6f87576ce28977 SHA-1: 560a4201058f19b04994136092104de6eca5629f SHA-256: 99df1b98a2fed4a37d6b6fcd2a4516d78a197479658c9f0f50909f7e0d3db7bb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous external links, many of which are SEO-optimized and point to pages related to game cheats and free spins, suggesting a lure for users seeking such content. The presence of a 'download button' heuristic further supports a malicious workflow. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/coin-master-free-spins-11-01-2021-game-hack PDF link annotation
    • http://garciamadeirascampinas.com.br/images/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/dailyrobux_GM431946152.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://garciamadeirascampinas.com.br/images/free-roebucks-no-human-verification_GM431946152.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_off0000488b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x488B 25128 bytes
SHA-256: 41c0d0fbd52e40a7e8b71c60942d7617d9a42c1373749b8a4cebce0ee03c6e9e
font_01_sfnt_off00008169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8169 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1B 18288 bytes
SHA-256: 24895b65f98328fb27e7c69f6686c9deb14e0c1b0b62a883e5ab50589681f060

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