Malicious PDF — malware analysis report

Static analysis result for SHA-256 29acdad8047327e2…

MALICIOUS

PDF

47.0 KB Created: 2021-05-14 20:02:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2b4193bd7adaed14f8159a0829403797 SHA-1: 37a59c7a38ec08117716952e9ed482f9d761f434 SHA-256: 29acdad8047327e26aa2b10431df008381f527eb647882fd3d3448e649af976c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are hosted on sparkthis.org and appear to be part of a link farm designed to attract users searching for in-game currency or cheats. The ML classifier also flagged this PDF as malicious. The document body contains obfuscated text and URLs related to 'Robux' and 'Coin Master', suggesting a lure for users seeking these items, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/rbx-sites-game-hack
    • https://sparkthis.org/ckfinder/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/free-spins-coin-master-links-blogspot_GM406889139.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/todays-free-spin-and-coin-links_GM406889139.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/coin-master-free-spins-link_GM406889139.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/minecraft-hack-client-download_GM479516143.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/how-do-you-get-free-food-in-coin-master_GM406889139.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/roblox-gang-rape_GM431946152.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/free-robux-rewards_GM431946152.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/robux-gift-card-free_GM431946152.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/coin-master-villages_GM406889139.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/real-free-robux-codes_GM431946152.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/free-25-spins-coin-master-links_GM406889139.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/androeed-ru-minecraft_GM479516143.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/free-robux-generator-no-survey_GM431946152.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/minecraft-free-download-ios_GM479516143.pdf
    • https://sparkthis.org/ckfinder/userfiles/files/coin-master-free-spin-generator-without-human-verification_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a30.bin
5463a50aa06dc36df57090f9e4b5cb69e5bfa76427e7128e1a30b183909bde9c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A30 27020 bytes
font_01_sfnt_off0000866c.bin
b8980cdac4d025496d9fe039d8c05bb5b9bae1b804244a1f9c05e9663db72816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x866C 4660 bytes
font_02_sfnt_off0000967c.bin
22e4ea1392051312d24b7ae20649c43ebaa2c374788868ee3dffd03a98dca53a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x967C 17792 bytes

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