Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56b1d7ec31bbc0d…

MALICIOUS

PDF

44.7 KB Created: 2021-05-19 06:33:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 439b10358fe067fbd771aa073ef7fc53 SHA-1: a7a5a0cda408c973ff32ac1a84d55c0875801dd7 SHA-256: c56b1d7ec31bbc0df3377cf7432499495df72563b4c5235f90c0bc0eacb365d2
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains numerous links to external websites, many of which are related to free in-game currency or items for popular games like Roblox and Coin Master. The presence of a PDF URI heuristic and the ML classifier flagging this PDF as malicious strongly suggest it is designed to redirect users to potentially harmful sites. The document body, though partially corrupted, contains similar URLs, reinforcing the lure for free items which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/free-spins-coin-master-links-blogger-game-hack
    • http://itc-nekretnine.hr/files/free-robux-no-download_GM431946152.pdf
    • https://www.itc-nekretnine.hr/files/roblox-avatar-editor-free_GM431946152.pdf
    • http://itc-nekretnine.hr/files/roblox-exploit-scripts_GM431946152.pdf
    • https://www.itc-nekretnine.hr/files/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • https://www.itc-nekretnine.hr/files/free-robux-hack_GM431946152.pdf
    • http://itc-nekretnine.hr/files/coin-master-rewards_GM406889139.pdf
    • https://www.itc-nekretnine.hr/files/how-to-hack-roblox-accounts_GM431946152.pdf
    • https://www.itc-nekretnine.hr/files/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdf
    • https://www.itc-nekretnine.hr/files/robux-generator-no-survey_GM431946152.pdf
    • http://itc-nekretnine.hr/files/coin-master-fan_GM406889139.pdf
    • https://www.itc-nekretnine.hr/files/minecraft-bedrock-download-pc-free_GM479516143.pdf
    • http://itc-nekretnine.hr/files/free-money-links-coin-master_GM406889139.pdf
    • https://www.itc-nekretnine.hr/files/free-robux-no-verify-2021_GM431946152.pdf
    • http://itc-nekretnine.hr/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdf
    • http://itc-nekretnine.hr/files/how-to-get-free-robux-by-playing-games_GM431946152.pdf
    • https://www.itc-nekretnine.hr/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdf
    • http://itc-nekretnine.hr/files/spin-rewards-coin-master_GM406889139.pdf
    • https://www.itc-nekretnine.hr/files/free-robux-without-human-verification-real_GM431946152.pdf
    • http://itc-nekretnine.hr/files/robux-gainer_GM431946152.pdf
    • https://www.itc-nekretnine.hr/files/free-robux-exe_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048d9.bin
f4179a25df2378eea615bb4a09d8466753c78d02c93af05d80f40c989a08d16d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48D9 24548 bytes
font_01_sfnt_off00008133.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
pdf-font-stream PDF embedded font (sfnt) at offset 0x8133 2880 bytes
font_02_sfnt_off00008b1d.bin
e19cb03e4db5dc0ff2825ab1b6cd29120edbbac4e5fd870bab1836bcb421f615
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1D 18632 bytes