Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af9b9ea886c8f45…

MALICIOUS

PDF

35.0 KB Created: 2021-06-29 05:33:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 192705d35cc1c785ec01e83a8304f844 SHA-1: 5829984589bd663fe948d1f050a97d75f52fd15a SHA-256: 7af9b9ea886c8f4580fbfff6dacd86c6f0d6471297315620e5214256b61cbaef
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, many of which are SEO-optimized PDFs hosted on a subdomain of elearning.mtsusbbatam.com, and one direct link to netcdn.co. The document body and heuristics indicate a lure for free Robux and game hacks, suggesting a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm points towards a tactic to distribute malicious content or redirect users to phishing sites.

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/earn-free-robux-2021-game-hack
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/minecraft-pocket-edition-free-download_GM479516143.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/hacks-for-booga-booga-on-roblox_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/comment-avir-des-robux-sans-hack_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/how-to-sell-roblox-clothes-for-free_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/haktuts-coin-master-free-spin-link_GM406889139.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/how-to-minecraft-for-free_GM479516143.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/hack-robux_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/minecraft-free-computer-game_GM479516143.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/free-roblox-private-server-links_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/free-noob-clothes-roblox_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/fightfor-glorton-free-l-robux_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/roblox-jailbreak-hacks-april-2021_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/coin-master-free-cards_GM406889139.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/roblox-cheat-engine-hacks-admin-script_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/how-to-get-free-robux-fast-and-easy-2_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/coin-master-free-coins-and-spins-app_GM406889139.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/fly-hack-roblox-tm_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/free-advertising-on-roblox_GM431946152.pdf
    • https://elearning.mtsusbbatam.com/__statics/gudangsoal/files/how-to-get-free-robux-no-scams-no-hacks_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003125.bin
22e6c59286a59e8c45c2cbfbdfc36a199e2bb8c0b60d1bbb582ddb23325b075f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3125 22820 bytes
font_01_sfnt_off0000638c.bin
f53d0c0d92abbe590295915ce09fda31863d774b7dc02ceb79bd4622ffcba071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638C 19116 bytes

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