Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db1af6618e19239…

MALICIOUS

PDF

47.0 KB Created: 2021-05-11 14:35:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e736a1221bf13d553e8d1e42b46d2dae SHA-1: 84c611ec6187fe38dc9f659d0698dadde8108aa3 SHA-256: 5db1af6618e1923934e20f299af98ea30f427a55152a8bb76db8f8bc44a3d4a5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a link farm heuristic indicates a large number of external links, likely for SEO manipulation or to host malicious content. The document body and extracted URLs suggest a lure related to 'free Robux' and game hacks, aiming to trick users into clicking through to potentially harmful sites. The ML classifier also flagged this PDF as malicious.

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/roblox-fun-com-free-robux-game-hack
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-as-a-kid_GM431946152.pdf
    • https://www.sarsen.net/uploads/files/files/free-robux-codes-generator-no-verification_GM431946152.pdf
    • https://www.sarsen.net/uploads/files/files/free-robux-no-verification-2021-android_GM431946152.pdf
    • https://www.sarsen.net/uploads/files/files/apps-to-get-free-robux_GM431946152.pdf
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-2021_GM431946152.pdf
    • https://www.sarsen.net/uploads/files/files/rblx-city-free-robux_GM431946152.pdf
    • https://www.sarsen.net/uploads/files/files/minecraft-hax-download-no-virus_GM479516143.pdf
    • https://www.sarsen.net/uploads/files/files/kuso-icu-roblox-hack_GM431946152.pdf
    • https://www.sarsen.net/uploads/files/files/rbxfree-com-free-robux_GM431946152.pdf
    • https://www.sarsen.net/uploads/files/files/100-free-spins-for-coin-master_GM406889139.pdf
    • https://www.sarsen.net/uploads/files/files/coin-master-free-coins-today_GM406889139.pdf
    • https://www.sarsen.net/uploads/files/files/roblox-premium-free_GM431946152.pdf
    • https://www.sarsen.net/uploads/files/files/minecraft-coins-free_GM479516143.pdf
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • https://www.sarsen.net/uploads/files/files/minecraft-free-online-unblocked_GM479516143.pdf
    • https://www.sarsen.net/uploads/files/files/free-online-games-like-minecraft_GM479516143.pdf
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-tuts_GM406889139.pdf
    • https://www.sarsen.net/uploads/files/files/roblox-redeem-codes-free_GM431946152.pdf
    • https://www.sarsen.net/uploads/files/files/all-links-for-free-spins-coin-master_GM406889139.pdf
    • https://www.sarsen.net/uploads/files/files/apps-that-give-you-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bba.bin
40c0c3a7735207d965886bd59382660e5c41a0bf0a2e34841fe484359db0a781
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BBA 26968 bytes
font_01_sfnt_off00008ae2.bin
889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE2 2984 bytes
font_02_sfnt_off0000950e.bin
9560f0e6f9a4e6be006083e3696e79311a38bb173f302534750988b281bae61f
pdf-font-stream PDF embedded font (sfnt) at offset 0x950E 18348 bytes