Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6f676b1a09f377…

MALICIOUS

PDF

44.1 KB Created: 2021-05-15 23:39:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0b1996cb4ef89a6d9ca4d6c9db7c6b94 SHA-1: d811d0df242bef1a81e17416e329ad1e9cb51554 SHA-256: 1f6f676b1a09f3770b24ca9eb6072978030d2fecbebf574ff694cf518044b542
182 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are SEO-optimized and point to pages related to 'free robux' or 'coin master spins', suggesting a scam or phishing lure. The presence of a fake CAPTCHA heuristic indicates the document is designed to trick the user into interacting with these links, potentially leading to further malicious content or credential harvesting. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/games-that-give-you-free-robux-game-hack PDF link annotation
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/robuxhub-net_GM431946152.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://man1-kotagorontalo.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn 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_off000048d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D9 27288 bytes
SHA-256: 9a112885450747faee9ccde4f991a9c346c071319ca218dbe22333b9f694e873
font_01_sfnt_off00008790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8790 19168 bytes
SHA-256: c4d6735542cd49b50f18b2921f89e54fe5d8ee4af3f47c61005942af246faebd

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