Malicious PDF — malware analysis report

Static analysis result for SHA-256 512b8c5a2357d9c7…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 11:44:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 953c98a752bddf73278004ff33600b0c SHA-1: 654ea3ae412dceebf3b16e2f6f72ebc7b47aa07a SHA-256: 512b8c5a2357d9c71c2a548578892c006eb7ed361e713a91d82677283cc4c1a4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a document body that promotes game hacks and free items, strongly suggesting a lure for users to download malicious content or visit phishing sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and ML_NYX_PDF_MALICIOUS confirms a high probability of maliciousness. The document's content and structure point towards a spearphishing attachment used to distribute further malware or lead users to malicious websites.

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/hack-to-send-gold-cards-on-coin-master-game-hack
    • http://pet.nfe.go.th/petnfe/userfiles/files/roblox-hack-no-survey-no-download-2021_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/minecraft-games-free-download_GM479516143.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-roblox-accounts-with-robux-2021-november_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-tix-and-robux-no-download_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/coin-master-gold-cards-free_GM406889139.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/coin-master-free-spins_GM406889139.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/hiw-to-get-free-robux-on-roblox-2021-fast_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/coin-master-daily-spin-free_GM406889139.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/rc1-roblox-hack_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/coin-master-spins-for-free_GM406889139.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-girl-skins-for-roblox_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/how-to-get-a-free-hat-on-roblox-2021_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/how-to-use-redstone_GM479516143.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/roblox-battle-royale-hack-script_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/coin-master-free-spin-software_GM406889139.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/minecraft-windows-10-free-with-java_GM479516143.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/minecraft-wurst_GM479516143.pdf
    • http://pet.nfe.go.th/petnfe/userfiles/files/roblox-royale-high-outfit-hacks_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f96.bin
8d67c0e58eae297c7399609cce24f653f5adb99d4d665120ef64664610a2ccc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F96 22048 bytes
font_01_sfnt_off00006024.bin
2404e29e1a45577db7d9d1851bba941e7ce9a3146c2b043007f3b8db4c3efe9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6024 18252 bytes