Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d9f7bdbf78d89e…

MALICIOUS

PDF

43.6 KB Created: 2021-05-14 18:30:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2f3155d7b5920b208f78d76b339c2a2c SHA-1: 1baf4a5642cc055e8d05be8807d723b7964af6ff SHA-256: 11d9f7bdbf78d89e84eb6ef01ac3c388fa540403201756ccfe594cd0b3ef2f43
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. The primary URL, https://netcdn.xyz/app/406889139/coin-master-free-spin-link-list-game-hack, and others hosted on himalayandiscoverytrek.com, suggest a link farm designed to attract users with lures like 'Coin Master Free Spin Link List'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and heuristics point to a malicious document likely intended to redirect users to potentially harmful content or facilitate further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/coin-master-free-spin-link-list-game-hack
    • http://himalayandiscoverytrek.com/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/free-robux-earn_GM431946152.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/coin-master-free-rewards-link_GM406889139.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/minecraft-pocket-edition-free-download_GM479516143.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/can-i-get-minecraft-for-free_GM479516143.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/ear-free-spins-for-coin-master_GM406889139.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/https-oprewards-com-roblox_GM431946152.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/free-robux-ad_GM431946152.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/20-free-spins-coin-master_GM406889139.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/minecraft-java-edition-free-download_GM479516143.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/free-robux-no-verification-at-all_GM431946152.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/how-to-hack-coin-master-game-without-root_GM406889139.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/coin-master-cards_GM406889139.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/free-diamonds-coin-master_GM406889139.pdf
    • http://himalayandiscoverytrek.com/userfiles/files/hacked-roblox-accounts-list_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b3c.bin
7ea0a9fc926c53432faef2fcb0539190eea3ae976c767bb789266da5efb027aa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B3C 26780 bytes
font_01_sfnt_off00008910.bin
a4f33549350803e8a819cbfad6b4ff3cdc0b302ceab74af9f2f663eab6bd9ec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8910 18056 bytes

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