Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca9ff2cd353107b…

MALICIOUS

PDF

47.0 KB Created: 2021-05-16 05:06:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 809472bb57e1fa8d51935b784f1fff98 SHA-1: 626bb8711a53d05a853e27dd34bbb5e1184b9cc6 SHA-256: 3ca9ff2cd353107b54939d16b1f6bf2277a39ac84dfbcdd94a4b6c056b373228
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a link farm, pointing to other PDF files. The primary URL, https://netcdn.xyz/app/406889139/free-links-coin-master-game-hack, suggests a lure related to game hacks or cheats. The presence of a 'Download Now' heuristic further supports a malicious workflow. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/406889139/free-links-coin-master-game-hack
    • http://rexingen.info/images/blox-fish-free-robux_GM431946152.pdf
    • http://rexingen.info/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://rexingen.info/images/how-to-change-your-username-on-roblox-for-free_GM431946152.pdf
    • http://rexingen.info/images/202100-free-spins-coin-master_GM406889139.pdf
    • http://rexingen.info/images/how-to-get-free-robux-easy_GM431946152.pdf
    • http://rexingen.info/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • http://rexingen.info/images/coin-master-unlimited-spin-link_GM406889139.pdf
    • http://rexingen.info/images/25-free-spins-coin-master_GM406889139.pdf
    • http://rexingen.info/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdf
    • http://rexingen.info/images/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdf
    • http://rexingen.info/images/can-you-really-hack-coin-master_GM406889139.pdf
    • http://rexingen.info/images/free-coins-coin-master-2021_GM406889139.pdf
    • http://rexingen.info/images/free-spin-coin-master-twitter_GM406889139.pdf
    • http://rexingen.info/images/free-minecraft-alts_GM479516143.pdf
    • http://rexingen.info/images/roblox-download_GM431946152.pdf
    • http://rexingen.info/images/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • http://rexingen.info/images/coin-master-20-free-spins-link-2021_GM406889139.pdf
    • http://rexingen.info/images/coin-master-free-spins-cheat_GM406889139.pdf
    • http://rexingen.info/images/microsoft-free-robux_GM431946152.pdf
    • http://rexingen.info/images/free-daily-spins-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004be8.bin
231a2f5a0c4a747b96cbc165816fa4c1912e907b0faa567ebee232239a219f20
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE8 28020 bytes
font_01_sfnt_off00008a03.bin
a7ffd47631dfdffd19913a7d019e14a4e4f6584a4e894343a0be0687632311e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A03 3620 bytes
font_02_sfnt_off000096c5.bin
c5130e18caf6f7222c4492e4e2e2fc6b4580e14129763dcab090a363ad6db2dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x96C5 17880 bytes