Malicious PDF — malware analysis report

Static analysis result for SHA-256 72528f1a89f0e45e…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 11:31:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 23208c0ac7ad41bc980785afeacc828b SHA-1: 84bd0545a7a359f6ff5b4f2b3547bf4e9501987f SHA-256: 72528f1a89f0e45e339e094a522299d1d70bff32e9269573d8e16eca6e07f997
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering free Robux or game cheats. The ML classifier strongly indicated maliciousness, and the document body confirms a lure for potentially harmful content. The primary attack vector appears to be directing users to malicious websites via these links, likely for phishing or malware distribution.

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.tw/app/431946152/can-you-get-free-robux-on-roblox-game-hack
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/earn-free-robux-for-roblox_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/free-robux-no-survey-or-human-verification-or-download_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/daily-spins-coin-master_GM406889139.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/how-do-you-hack-roblox_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/free-views-tiktok_GM835599320.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/roblox-free-exploit-dex_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/how-to-free-robux_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/get-free-robux-pastebincom_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/how-to-play-roblox-for-free-on-computer_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/minecraft-bedrock-download-pc-free_GM479516143.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/withdraw-robux_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/please-can-i-have-robux-for-free_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/roblox-level-7-script-executor-free_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/play-roblox-online-for-free-no-download_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/promo-code-free-robux_GM431946152.pdf
    • https://elearning.miislamiyahrgj.sch.id/__statics/gudangsoal/files/minecraft-alt-accounts-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000319c.bin
ef17c96cd431801b00195fedf0a01477a9ab73c980a4b68200ca4cb8e36fd23f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x319C 22524 bytes
font_01_sfnt_off00006437.bin
212cafc25ec0536741ac5c1aa90543f36b34a777adc44243741e4ba36ab4d37b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6437 19056 bytes

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