Malicious PDF — malware analysis report

Static analysis result for SHA-256 56051ab6addd2e7d…

MALICIOUS

PDF

45.5 KB Created: 2021-05-14 21:53:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9fcd071ff1253e8c91aa371a18b3f883 SHA-1: 840b291640dec2972687fd1beeca163aaa45a93e SHA-256: 56051ab6addd2e7d1a345ab656509ab3456b847131ca9cb0bdf1830dc995664d
82 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and a visual call-to-action, strongly suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs and the document's content indicate a likely attempt to redirect users to malicious websites for credential harvesting or other fraudulent activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/coin-master-blogspot-free-spins-game-hack
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/coin-master-el-tiger-card-free_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-hack-in-roblox-prison-life_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/hacks-to-get-free-robux_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/can-i-have-robux_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/coin-master-spin-cheat_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/hack-master-coin_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-coin-master-credit_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-robux-earn_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/roblox-girl_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-roblox-followers-generator_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/cheats-coin-master-free-spins-and-news_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/coin-master-32-mod-hack-apk-download_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-coins-coin-master-link_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/roblox-zone-free-robux_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-coins-2021-coin-master-link_GM406889139.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/free-robux-wheel_GM431946152.pdf
    • http://www.vaytechceramic.com/uploaded_files/userfiles/files/microsoft-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b2a.bin
a2ae1809ad14a5b84154927473aef6afc66c7c0adb790a3f2eed32c609ec3403		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B2A 25512 bytes
font_01_sfnt_off0000852f.bin
96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852F 2820 bytes
font_02_sfnt_off00008ed0.bin
2b0c06a22c9a5edb3443ab86616b5007231cf3140ae51cb1863842ad9c8d5786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED0 18464 bytes

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