Malicious PDF — malware analysis report

Static analysis result for SHA-256 569fea0c065c76b0…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 22:05:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a712d9efb1a687c15dfd1b06210d99c1 SHA-1: 0250a7a056b0857ad3d4b35ec56c8f92066b85fb SHA-256: 569fea0c065c76b02dc7b1cf09d708c04705716b42c0b01bdccbd5a36a11477c
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which appear to be part of an SEO link farm, suggesting a deceptive purpose. The document body, though heavily obfuscated, contains references to 'free Robux' and a URL that further supports a lure-based attack pattern. The presence of a 'download button' heuristic and the ML classifier's high confidence indicate a malicious intent, likely to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.online/app/431946152/can-you-get-free-robux-on-roblox-game-hack
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-official-website_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/can-you-host-a-minecraft-server-for-free_GM479516143.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/apps-to-hack-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/blox-land-free-robux_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/coin-master-hack-online-generator_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/robux-sites_GM431946152.pdf
    • http://library.stieyapan.ac.id//repository/try-coin-master-hack_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/free-rare-cards-for-coin-master_GM406889139.pdf
    • http://library.stieyapan.ac.id//repository/minecraft-windows-10-hacked-client_GM479516143.pdf
    • http://library.stieyapan.ac.id//repository/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://library.stieyapan.ac.id/repository/how-to-change-your-name-on-roblox-for-free_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/robux-game_GM431946152.pdf
    • http://library.stieyapan.ac.id/repository/coin-master-hack-app-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005282.bin
fdca321891caf6a6452e416bfb5f1c85d0f1fa5f4f1c5adde463d8cb535d03c5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5282 28128 bytes
font_01_sfnt_off00009342.bin
0d0c29456045ba8700eeeb9b5d08ef238a74b3c73615dbb1a220be23830403a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9342 18580 bytes

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