Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba31fb3a3aa65755…

MALICIOUS

PDF

42.4 KB Created: 2021-05-15 07:43:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 88b66d94b98c81ec54cc532fee47f993 SHA-1: 531fd362da6cd842413c06eda0fec9ce6f486e41 SHA-256: ba31fb3a3aa657558b1a27723fb6252dd066a1d1d768330a4112b4943aafd3e5
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a "link farm" designed to direct users to external sites, many of which are related to game hacks and free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of a "download button" lure further supports a malicious intent to trick users into downloading potentially harmful content. The document body and embedded URLs suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/claim-gg-free-robux-game-hack
    • http://technologicalsc.com/images/coin-master-hack-apk-no-fb-login_GM406889139.pdf
    • http://technologicalsc.com/images/free-robux-just-enter-username_GM431946152.pdf
    • http://technologicalsc.com/images/free-spins-coin-master-daily_GM406889139.pdf
    • http://technologicalsc.com/images/coin-master-free-spins-gratis_GM406889139.pdf
    • http://technologicalsc.com/images/coin-master-hack-spin-link_GM406889139.pdf
    • http://technologicalsc.com/images/como-hackear-coin-master-en-espaol_GM406889139.pdf
    • http://technologicalsc.com/images/free-roebucks_GM431946152.pdf
    • http://technologicalsc.com/images/coin-master-free-spin-whatsapp-group-link_GM406889139.pdf
    • http://technologicalsc.com/images/coin-master-spins-gratis_GM406889139.pdf
    • http://technologicalsc.com/images/is-minecraft-free-on-computer_GM479516143.pdf
    • http://technologicalsc.com/images/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • http://technologicalsc.com/images/how-to-get-free-premium-roblox_GM431946152.pdf
    • http://technologicalsc.com/images/get-free-roblox_GM431946152.pdf
    • http://technologicalsc.com/images/minecraft-windows-10-edition-free-with-java_GM479516143.pdf
    • http://technologicalsc.com/images/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://technologicalsc.com/images/free-coins-on-coin-master_GM406889139.pdf
    • http://technologicalsc.com/images/free-spins-and-coins-coin-master-facebook_GM406889139.pdf
    • http://technologicalsc.com/images/minecraft-hack-download_GM479516143.pdf
    • http://technologicalsc.com/images/robux-redeem_GM431946152.pdf
    • http://technologicalsc.com/images/robux-hack-generator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a05.bin
2e42dbc31006871d8e57bd57a03a67612a3e40f6851fb2f138ba62e0c2584ce8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A05 24196 bytes
font_01_sfnt_off00008142.bin
f4ec7cc5ac7357ae04b81b01f4f60b03f50baf34e575c591e7a4d82bee829dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8142 18984 bytes

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