Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4a641a6b7d8548…

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 17:13:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 56d91ba56b41aa03381deefe4b66354f SHA-1: cd30b4706f2cef5aa11495f5d599778e39ddd15b SHA-256: 4a4a641a6b7d85482bc6ff14fd38c4de2049ba2940a0d2d983c243270d0f281c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a 'doc body' that advertises free in-game currency and hacks for popular games like Coin Master and Roblox. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which point to other PDFs hosted on a repository site, suggesting a link-farming or redirection scheme. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of the file. The primary attack pattern involves luring users to click on these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-heaven-free-spins-link-2021-game-hack
    • http://digilib-ppsunisma.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/new-hack-for-roblox-2021-december-download-mediafire-jailbreak_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/coin-master-heaven-links_GM406889139.pdf
    • http://digilib-ppsunisma.ac.id/repository/roblox-hack-2021-free-robux-generator-working-method-scratch_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/roblox-name-chace-hack_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/how-to-hack-roblox-without-verification_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/free-robux-websites-2021_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-robux-no-joke-2021_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/minecraft-realms-free-codes_GM479516143.pdf
    • http://digilib-ppsunisma.ac.id/repository/free-accounts-with-space-names-roblox_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/comment-telecharger-un-logiciel-de-hack-dur-roblox_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/change-roblox-username-for-free_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/get-free-lives-on-coin-master_GM406889139.pdf
    • http://digilib-ppsunisma.ac.id/repository/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdf
    • http://digilib-ppsunisma.ac.id/repository/unlimited-robux-hack-download-android_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/btools-hack-roblox-jailbreak-2021_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdf
    • http://digilib-ppsunisma.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003409.bin
d3b94f8d7005a7ab6bee5b82740e576db45aae489901319a3e8976cbc7d641f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3409 22356 bytes
font_01_sfnt_off000065c0.bin
dfc838dfabd2f26dfea1cee387d52c49c563aa6385bf606e9c812772a9b3008e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C0 18860 bytes

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