Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4072df7e9c79b8…

MALICIOUS

PDF

33.4 KB Created: 2021-07-06 00:50:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 410ece20721ed38ff1df1d360f6abb36 SHA-1: 8eebc9c72a1d1e13bab9b869593cf0f24da8e19b SHA-256: 3a4072df7e9c79b8fe422d7b94c1b6ff90228f8eb53d0ab6b4bd6539fca0b652
122 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URIs pointing to external PDF documents, many of which are hosted on the IP address 202.56.165.220. This indicates a link farm designed to lure users with promises of free game items or hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to redirect users to potentially malicious content or exploit kits.

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/479516143/free-minecraft-java-code-game-hack
    • http://202.56.165.220/digilab/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/free-robux-2021-no-human-verification_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/free-robux-clicker_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/coin-master-free-rare-cards_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/coin-master-for-pc-free-download_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/how-to-get-free-robux-on-ipad-2021_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/free-roblox-synapse_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/roblox-dragonball-cheat-engine_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/free-robux-cards_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/free-spins-on-coin-master-links-2021_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/roblox-hack-hay-day_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/como-hackear-roblox-con-game-guardian_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/free-robux-november_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/the-neighbourhood-roblox-money-hack-pastebin_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/free-roblox-clothes-codes-2021_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdf
    • http://202.56.165.220/digilab/repository/robux-hack-v6-5_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/how-to-hack-rabbit-simulaator-2-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e64.bin
089868801b18da568dc7379d043d322fcee94061a0462e8eece98804b6a6b705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E64 22288 bytes
font_01_sfnt_off00005f63.bin
5311ff163cb5fa31e0ff5346c8b8368b0c4116a432924275301f829a2985271a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F63 18452 bytes

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