Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1a61a0a2a442aa…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 12:16:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2e0fc1a585d3b2cd8bb65dfa811d63e6 SHA-1: 5e8abb71e030cd9eb2c7617a426e4d216d41b642 SHA-256: 8c1a61a0a2a442aa73d7467bd69d7b50803ff78d4acc001cf91b3a03c231b0dd
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm, pointing to sites offering game cheats and free in-game currency. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a 'download' button lure reinforces this assessment. The primary IOC is the initial external URI, which likely serves as the entry point for the malicious chain.

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/406889139/coin-master-free-spins-link-hack-game-hack
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-daily-free-spins_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-no-survey-and-no-human-verification_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-scam-the-scammers_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-no-human-verify_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-no-anti-bot-verification_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdf
    • http://library.stipjakarta.ac.id/etd/repository/cheats-in-vehicle-simulator-roblox_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-dominus-roblox-avatar_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-no-verification-at-all_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-safe_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/rbxnow-gg-free-robux_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/best-free-avatar-on-roblox_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/btools-roblox-hack-2021_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/roblox-pet-simulator-jump-hack_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/robux-bot-hack_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-robux-safely_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-links-free-spins_GM406889139.pdf
    • http://library.stipjakarta.ac.id/etd/repository/roblox-robux-admin-hack_GM431946152.pdf
    • http://library.stipjakarta.ac.id/etd/repository/roblox-hack-client_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003181.bin
2df386cd09375a3e6aee149e58afda5fd83e50042f19262ed19ec2b8d9c0e0ab		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3181 22324 bytes
font_01_sfnt_off00006319.bin
0b72bc8737a749971cae617558934a0ee4712de3499baa483a9ef910788e25c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6319 18344 bytes

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