Malicious PDF — malware analysis report

Static analysis result for SHA-256 5690a997a60747f1…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 21:40:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8caf66ee579b8d6b7199d08fa3552063 SHA-1: 9937a5d03cb22950972bee2e771d84c55df4be19 SHA-256: 5690a997a60747f131979c19698c8271e44f191b6252f9beeac1ff004ab7406f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which are part of a link farm, and displays a fake CAPTCHA to trick users. The primary URL, 'https://netcdn.xyz/app/431946152/make-free-robux-game-hack', suggests a lure for game-related cheats or exploits. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious or scam websites, potentially leading to further exploitation or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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/431946152/make-free-robux-game-hack
    • https://www.thecongostore.com/uploaded_files/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/roblox-executor-free-download_GM431946152.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/roblox-free-robux_GM431946152.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-email-free-spins_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-free-spins-link-facebook_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/free-robux-promo-codes-2021_GM431946152.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-free-spins-fb_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-free-spins-no-generator_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification_GM431946152.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/roblox-booga-booga-hack_GM431946152.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/how-to-get-robux-easy_GM431946152.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/free-coins-coin-master-daily_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/free-robux-microsoft_GM431946152.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today-ios_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-hacks-no-downloading_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-hack-no-verification-no-signup_GM406889139.pdf
    • https://www.thecongostore.com/uploaded_files/userfiles/files/daily-coin-master-free-spin-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae4.bin
6f5066c1e55d357bc907d69d464c28e72d7483f3cde5bbc69034a8891b9ef00f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE4 24552 bytes
font_01_sfnt_off0000833e.bin
ffc801fe6c311414aab45f29f725ac19f85306497fb99419c1a1229f9950fbca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x833E 18608 bytes

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