Malicious PDF — malware analysis report

Static analysis result for SHA-256 255b0a09e57e770d…

MALICIOUS

PDF

44.9 KB Created: 2021-05-16 21:04:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fc83960a9aa1b96c6bee7284d006fad9 SHA-1: 1f580ad74106241e55e23cdee6dc836385a90de2 SHA-256: 255b0a09e57e770d43089b081e55b953a0ded87f6ce0579c0a959cf09f44cb41
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to resources related to game hacks and cheats, indicating a lure for users to download potentially unwanted or malicious software. The presence of a 'download button' heuristic further supports this phishing-like attack pattern. 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-hack-app-2021-game-hack PDF link annotation
    • http://columbuscigar.com/images/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/rbx-sites_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/master-coin-free_GM406889139.pdfIn PDF document text
    • http://columbuscigar.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://columbuscigar.com/images/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://columbuscigar.com/images/coin-master-free-spin-sites_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
font_00_sfnt_off00004c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C68 25392 bytes
SHA-256: 1c81586e0feca63f6566cb7e8490dd3887d782c3f11d3aeaf9ac814d7aa29d33
font_01_sfnt_off00008305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8305 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB7 18296 bytes
SHA-256: bf349ca5353405da50dde13ab4b8c776ba4b0a629ab8eb4a4600605684f4a994

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