Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdaea20fd540e7e7…

MALICIOUS

PDF

41.1 KB Created: 2021-05-19 16:18:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c6d85872988cfe7d25ad683030213675 SHA-1: 9af01e9d232722226c5e04ae4c697f2cb1a8d573 SHA-256: bdaea20fd540e7e71f5e6c3ccba4aba5dc8cd067c30667e0ba89c026f3a3283d
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to files related to popular games like Robux and Coin Master. The primary URL, https://netcdn.xyz/app/431946152/robux-game-hack, suggests a lure for game cheats or hacks. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/robux-game-hack
    • https://laokhwanhos.com/ckfinder/userfiles/files/games-to-get-free-robux_GM431946152.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/coinmaster-links_GM406889139.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/com-roblox_GM431946152.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/coin-master-cards-free-cards_GM406889139.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/minecraft-java-edition-free-code_GM479516143.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/roblox-games-with-free-radio_GM431946152.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/can-you-really-hack-coin-master_GM406889139.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/roblox-games-free_GM431946152.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-roblox-acc_GM431946152.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/whats-robux_GM431946152.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-minecraft-hacks_GM479516143.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/coin-master-free-spins-no-human-verification_GM406889139.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/roblox-hack-ga_GM431946152.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/coin-master-free-box_GM406889139.pdf
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000468d.bin
e0e75826c95226429e6fcf18970595bdbd6f3ce04e08a26e2742e4b37dabd368
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x468D 24708 bytes
font_01_sfnt_off00007f97.bin
ccf20ca1ad80d0cd2f0d464461636129858ae353cf2c3769b35ef20048afdef0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F97 17852 bytes