Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ada4de130b5583b…

MALICIOUS

PDF

45.5 KB Created: 2021-05-12 22:12:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ab729d22c443f49db7afe8778cb2b993 SHA-1: c83666875d4d263dc5ecf59091b43ac4448e3663 SHA-256: 8ada4de130b5583b7b8bdab90df3e414b7edb1a9dc7b73e2ff00f637c4445d34
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking a malicious link, likely to download a second-stage payload. The embedded URL and numerous other similar URLs found in the document point to sites offering game cheats or hacks, which is a common lure for malware distribution. No scripts were extracted, but the presence of a fake CAPTCHA and external links strongly suggests a malicious intent to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-spins-usa-2021-game-hack
    • https://maximabm.com/uploaded_files/userfiles/files/coin-master-claim-spins_GM406889139.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/minecraft-server-hacks_GM479516143.pdf
    • https://www.maximabm.com/uploaded_files/userfiles/files/get-free-robux-2021_GM431946152.pdf
    • https://www.maximabm.com/uploaded_files/userfiles/files/real-working-coin-master-hack_GM406889139.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/roblox-hacks-com_GM431946152.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/how-to-get-free-items-on-roblox_GM431946152.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/free-robux-card-codes_GM431946152.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdf
    • https://www.maximabm.com/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/minecraft-hacks-ps4_GM479516143.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/free-minecraft-printables-food-labels_GM479516143.pdf
    • https://www.maximabm.com/uploaded_files/userfiles/files/free-face-roblox_GM431946152.pdf
    • https://www.maximabm.com/uploaded_files/userfiles/files/free-roblox-clothes-codes_GM431946152.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/free-spin-coin-master-game_GM406889139.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/coin-master-free-spins-2021-app_GM406889139.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/how-to-get-free-robux-youtube_GM431946152.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdf
    • https://www.maximabm.com/uploaded_files/userfiles/files/free-robux-no-verify-2021_GM431946152.pdf
    • https://maximabm.com/uploaded_files/userfiles/files/get-minecraft-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c3f.bin
42d0fe8070f0b4691bb58a5f86aa741835da830ee18c33cf320df728d7e9330f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C3F 24684 bytes
font_01_sfnt_off000084d2.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D2 2840 bytes
font_02_sfnt_off00008e84.bin
16bf174bf6dc39212a7e0095f5095cb34a7632b0870544d55dc21d8537d09f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E84 18472 bytes

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