Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4a0f55c41b8734…

MALICIOUS

PDF

44.2 KB Created: 2021-05-17 07:09:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9d86624804f3a63be344d4dc513bad67 SHA-1: 98d7148b29c07a3dcbb9ca42db116d5bf197e75f SHA-256: 9f4a0f55c41b87346134eda4d8b527234012b4ffae75e978294f6d68fe6bc151
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which appear to be SEO-optimized for game-related lures like 'Coin Master' and 'Robux'. The heuristic 'SE_FAKE_CAPTCHA' suggests the document may also present a fake CAPTCHA to trick users into interacting further. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious intent, likely to drive traffic to malicious sites or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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
  • 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-link-download-game-hack
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master_GM406889139.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/can-i-play-minecraft-for-free_GM479516143.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/but-link-says-free-robux_GM431946152.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/free-robux-2021-no-verification_GM431946152.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/bit-ly-coin-master-hack_GM406889139.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/blox-supply-free-robux_GM431946152.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-free-coins-links-2021_GM406889139.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-facebook-page_GM406889139.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/minecraft-java-free-download_GM479516143.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/free-robux-no-scam_GM431946152.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-tricks-and-hacks_GM406889139.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/free-spins-coin-master-links-no-human-verification_GM406889139.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/can-you-hack-coin-master_GM406889139.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/robux-free-promo-codes_GM431946152.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/actual-free-robux_GM431946152.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-email_GM431946152.pdf
    • https://elearning.mtsnbatang.sch.id/__statics/gudangsoal/files/coin-master-links-to-free-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b84.bin
1eac9cce01d2ab23b24d8af90e184123a6abd193b6da59b76ddfb0bf1c3497e1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B84 26824 bytes
font_01_sfnt_off0000897b.bin
e0ee4d28e9fbd90893640acb023fdb3433a7d18e360fd79b0a1965f7934d0c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897B 18636 bytes

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