Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4815cdbc3157c69…

MALICIOUS

PDF

49.3 KB Created: 2021-05-12 01:31:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ed0ee28f119fb3e614753f499edf5a53 SHA-1: 9b74ba5d476c451b3d8426d52a863f9835a93f23 SHA-256: a4815cdbc3157c69850400788577af01327604010ac628baa72b7fc8ed2fcb7a
102 Risk Score

Malware Insights

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

The PDF contains numerous links to websites that appear to offer free in-game currency or cheats for popular games like Roblox and Coin Master. The presence of a visual download button and callback lure heuristics, combined with the ML classifier's high confidence, suggests a phishing or scam attempt designed to trick users into visiting malicious sites. No scripts were extracted, but the document body and heuristics strongly indicate a lure for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.xyz/app/431946152/free-robux-sites-2021-game-hack
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/minecraft-bedrock-client_GM479516143.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/robux-com-free_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-free-spins-link-2021-march_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-do-you-get-free-robux-2021_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-3533-android-hack_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/fake-robux-codes_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/free-robux-that-actually-works_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-get-more-robux_GM431946152.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-rewards-app_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-hack-ios-no-verification_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-hack-someones-minecraft-account_GM479516143.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/how-to-get-free-cards-on-coin-master_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-free-link-today_GM406889139.pdf
    • http://elearningmts.nurulfalahalhuda.com/__statics/gudangsoal/files/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • https://www.roblox.com
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bac.bin
b967dff0d267d80eaa27492a598da4aef95cedf22309d30a7d0a2da06fd8eeff		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BAC 28328 bytes
font_01_sfnt_off00008bcf.bin
f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCF 7272 bytes
font_02_sfnt_off00009d40.bin
b8260c20a5a482fa631977c1895ef4fabb59c0a91f65cf95745fb521070d0a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D40 18640 bytes

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