Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cfdaca38424e7f…

MALICIOUS

PDF

36.7 KB Created: 2021-07-09 02:34:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ad5b3ff1e99bb7a296a9c30a5d64388c SHA-1: 2429814299c10a5f4c0be7fe484360dd85fb32dd SHA-256: 25cfdaca38424e7f5c0b1738aa7f0918f0bcd9429f31432414eeb33a3bdd543f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized slugs pointing to other PDF files, suggesting a link farm designed to attract users searching for game cheats and hacks. The primary URL http://netcdn.tw/app/431946152/robux-generator-without-human-verification-game-hack likely hosts the malicious payload. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs supports a phishing or malware distribution scheme.

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/431946152/robux-generator-without-human-verification-game-hack
    • http://simon-skov-fougt.dk/billeder/cheat-codes-for-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/minecraft-bedrock-for-free_GM479516143.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/roblox-redeem_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-hack-coin-master-ios_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/all-coin-master-spin-link-and-free-download_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/free-minecraft-codes_GM479516143.pdf
    • http://simon-skov-fougt.dk/billeder/artmoney-roblox-hack_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-get-20210-robux-for-free_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/hack-to-send-gold-cards-on-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-get-free-robux-com_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/roblox-bloxburg-free-money_GM431946152.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-free-spins-link-2021-no-verification_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/free-online-spins-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/free-coins-spins-on-coin-master_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-generate-free-coin-master-spin_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/coin-master-hack-2021-ios_GM406889139.pdf
    • http://simon-skov-fougt.dk/billeder/how-to-setup-a-minecraft-server-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003447.bin
7d11c56c76e6954b73897d5d7483062f27c514cdc8993c7017552bdb1aa5dc18		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3447 23388 bytes
font_01_sfnt_off000068f1.bin
deebc8f9bbdea37fc1111490f8a4ce688f291d8ff4f9df131c81cbc4cdd3102e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F1 19532 bytes

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