Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3eab98857ec0f94…

MALICIOUS

PDF

34.7 KB Created: 2021-06-25 23:31:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1ce3afcd5a234ef28e280e07a91198c3 SHA-1: 376892b31d9f528ab021b160e03414da8a282e1c SHA-256: c3eab98857ec0f9433cbadc58c28c8c479c97154e7bf9c4d9830b4af418a8edd
122 Risk Score

Malware Insights

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

The PDF document contains a large number of SEO-optimized links, many of which point to purported game hacks or exploits for popular games like Roblox and Coin Master. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. The document body itself is heavily obfuscated but contains URLs that are consistent with the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/admin-free-roblox-game-hack
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-date-and-time-hack_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-free-download-linux_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/como-meterse-en-la-tienda-free-de-roblox_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/hoe-to-het-free-robux_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-offline-hack_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/legit-way-to-get-free-robux_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/hacking-roblox-project-lazarus-zombies_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/who-to-get-free-robux_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-followers-on-roblox_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/monttechscom-coin-master-free-spins_GM406889139.pdf
    • http://opac.akafarma-aceh.ac.id/repository/free-snowman-roblox_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/is-minecraft-free-on-ps4_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/can-you-get-minecraft-for-free_GM479516143.pdf
    • http://opac.akafarma-aceh.ac.id/repository/roblox-robux-hack-tool-2021_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/robux-redeem_GM431946152.pdf
    • http://opac.akafarma-aceh.ac.id/repository/scripts-hack-for-roblox-r2da_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003096.bin
6d10ab4d8859d0dce3ff100f7d6d4d839554fb0c1dcfc4114e2f986f5dc0da53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3096 22376 bytes
font_01_sfnt_off00006243.bin
791c58379e410c3d8b86de767ae5579927f8b5f0653abbe43ecac83011ae6a2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6243 19204 bytes

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