Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce76fde8607ca1c…

MALICIOUS

PDF

43.2 KB Created: 2021-05-18 01:34:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 00eea9a24f0691bcbb35a26087224428 SHA-1: c7101afea43875e358386c79f14b791378166947 SHA-256: 3ce76fde8607ca1c924affc5e8e31d9201d88e6e7f993df4bdcd79a313cbb745
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs and a link farm heuristic, indicating a strong attempt to redirect users to external sites. The document body and extracted URLs suggest a lure for game-related hacks (Robux, Coin Master), a common tactic for distributing malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/431946152/free-robux-ad-game-hack
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-hack-without-root_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/how-to-hack-coin-master-with-root_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/free-robux-no-verify_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/archery-master-3d-unlimited-coins-hack_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-unlimited-spin-link_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/free-roblox-items-codes_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-spin-link-2021_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-hack-pc-cheat-engine_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/get-free-robux-2021_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/ear-free-spins-for-coin-master_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-hack-cheat-generator-d_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/free-robux-just-click_GM431946152.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/coin-master-hack-cheat-engine_GM406889139.pdf
    • http://www.duchem.ae/uploaded_files/userfiles/files/games-like-minecraft-but-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000492d.bin
66fd1210f7ff56ae1298ecd68dfcc59f6a40b4345fcc37131ff186085460343c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x492D 27300 bytes
font_01_sfnt_off000086ee.bin
8548f8eac6602b4da1df91b5e613954ee993c39611fc0c0834e4b9af2cb2062a
pdf-font-stream PDF embedded font (sfnt) at offset 0x86EE 18188 bytes