Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ae7477e6290e45…

MALICIOUS

PDF

44.8 KB Created: 2021-05-12 02:21:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2ccfdcc1b01b44c24e13b9ae90dc7552 SHA-1: 50e0464e6d49401907f0b3e1a7424d0933991fc8 SHA-256: 55ae7477e6290e45fd39275b26abbfd8c72a9d2669f681b8e56f3beafa7c57ce
82 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a document body that promotes game-related 'freebies' and 'hacks', strongly suggesting a phishing or scam lure. The ML classifier also flagged this PDF as malicious. The presence of external links indicates an attempt to redirect the user to potentially malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • 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.
  • 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/daily-free-spins-coin-master-heaven-game-hack
    • http://repository.ummy.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/roblox-hack-app_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-minecraft-capes-no-mods_GM479516143.pdf
    • http://repository.ummy.ac.id//repository/easy-how-to-get-free-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/how-to-get-minecraft-for-free-ios_GM479516143.pdf
    • http://repository.ummy.ac.id//repository/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/is-roblox-free-on-ps4_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-robux-hack-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-coin-master-links_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/game-toolbox_GM479516143.pdf
    • http://repository.ummy.ac.id//repository/earn-free-robux-on-roblox_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/roblox-free-clothes-hack_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/gold-card-coin-master-free_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/coin-master-2021-free-spins-link-today_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/free-roblox-boy-hair_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-on-facebook_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/robux-hack-generator_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/robux-xyz_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ac6.bin
a979fa34b0e03053228177b9940e4b079da964b89747f076a44514a7b6c18072		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AC6 24836 bytes
font_01_sfnt_off0000829a.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x829A 2840 bytes
font_02_sfnt_off00008c4c.bin
83c7106d652078d6845a2ce66abf209357cb05486614c7f7fe473a519aef161c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4C 18420 bytes

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