Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bde15e5cc16ff07…

MALICIOUS

PDF

42.5 KB Created: 2021-05-11 23:35:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 61732caf4fc0a7065795ad3a86f93ff8 SHA-1: 836307ca1e6e1ded3c5fe881af02ebf06990a480 SHA-256: 1bde15e5cc16ff07cd88ba988f5b07fc4d8ac5679973bf00737d0e41b42ceb4b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a 'spin-link-coin-master-game-hack'. The heuristic 'SE_MFA_LURE' suggests a credential harvesting attempt, possibly by redirecting users to fake login pages. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/spin-link-coin-master-game-hack
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/free-coins-and-spins-in-coin-master_GM406889139.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/coin-master-free-spins-link-2021-march_GM406889139.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/minecraft-download-free-download_GM479516143.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/free-robux-codes-2021-not-used_GM431946152.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/minecraft-116-apk-download_GM479516143.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/free-spin-card-exchange-coin-master_GM406889139.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/hack-coin-master-for-free_GM406889139.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/robloxfun-com-robux_GM431946152.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/all-minecraft-handbooks_GM479516143.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/roblox-generator_GM431946152.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/how-to-get-roebucks-in-roblox_GM431946152.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/free-robux-games_GM431946152.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/free-spin-coin-master-hack-2021_GM406889139.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/coin-master-games-download-free_GM406889139.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/coin-master-hack-generator_GM406889139.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/free-executors-for-roblox_GM431946152.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/best-free-minecraft-hacked-client_GM479516143.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/minecraft-pe-server-hosting-free_GM479516143.pdf
    • http://xn--80adcduozbpo4eve.xn--p1ai/images/download-coin-master-apk-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c18.bin
9585c07afa66d091bdb59efa089b3099c8b5e6fd6c14e10fe52b02c927da8d90		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C18 24764 bytes
font_01_sfnt_off000084bc.bin
36e2a9e8d5493d71a45802091441cfba4dbdcc3e1acf36cfa44a264c3c73fcb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84BC 17892 bytes

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