Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8553214d7a92d03…

MALICIOUS

PDF

34.1 KB Created: 2021-07-08 22:07:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c7b024819d553a957de51b09af4a6d51 SHA-1: d3c8521c8e0f96f98cd768fbd1dfc3dc3dbc63b8 SHA-256: b8553214d7a92d039faab946a683f86bbe78273b8ee32c2d2a49fb3872995f40
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, that point to websites offering free in-game items and accounts. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious external sites via these links, which is a common phishing or scamming technique.

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/406889139/coin-master-free-spins-that-really-game-hack
    • https://www.dc-itsolutions.com/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/hacking-robux-for-free_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-tricks-and-hacks_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-free-card-link-today_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/easy-how-to-get-free-robux_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdf
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-links-for-free-spins-2021_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-codes-2021_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/minecraft-ps4-free_GM479516143.pdf
    • https://www.dc-itsolutions.com/userfiles/files/hack-coin-master-for-free_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/easy-robux-com_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-gen_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/robux-gratis-hack-pc_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-android_GM431946152.pdf
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-hack-generator-tool_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-free-soins_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdf
    • https://www.dc-itsolutions.com/userfiles/files/free-minecraft-accounts-2021_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f99.bin
3c21840598c678d38e36f5109d403d25ce7001a27b57e179a5ab6c280b97fe11
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F99 22436 bytes
font_01_sfnt_off000061a2.bin
6ce224978adda1273fbe859cfaaf113315cbbc733c62935cb77f5f7075e1d2c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x61A2 18592 bytes