Malicious PDF — malware analysis report

Static analysis result for SHA-256 217f487fbb497076…

MALICIOUS

PDF

35.0 KB Created: 2021-06-30 14:35:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 66ed2f68843677b5bba3406cc10d2224 SHA-1: a4d3256dd72b05a3e1a0becb6b508280aadc48e4 SHA-256: 217f487fbb497076dadba14358520b8c913c5ccc6e27aa6ad93bbb3fefedc1ce
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which are part of a link farm designed to attract traffic related to popular games like Roblox and Coin Master. The document body and heuristics indicate a lure for game cheats or in-game currency, likely leading to malware downloads. The ML classifier strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-use-cheat-engine-6.7-on-roblox-game-hack PDF link annotation
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-can-u-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/youtube-roblox-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/codes-for-free-sp-in-ice-cream-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-do-you-get-builders-club-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-roblox-accounts-with-life-time-obc_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-free-spins-blogspot_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
font_00_sfnt_off00002fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBA 22808 bytes
SHA-256: 7283c8cb04f647a76a4d86de0aca61ed84dde82aa3c782e9ea451139911742c9
font_01_sfnt_off000062ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EA 19332 bytes
SHA-256: cff4549003274304a114ecc70552462085c06ed3b04774ed795d65ef2b7a40db

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