Malicious PDF — malware analysis report

Static analysis result for SHA-256 c775c281e154538c…

MALICIOUS

PDF

45.9 KB Created: 2021-05-13 14:46:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bfa9ae62f4432dd1e5199760cbe80e27 SHA-1: 745e866ed5ee883e15ce7f5576425bd9fb12b3c9 SHA-256: c775c281e154538c94d186b0b4cc724eadf26d1aa88fb459e531428e8d41e0a4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which appear to be SEO spam related to games and hacks. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious or scam-related content, possibly leveraging PDF's scripting capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/coin-master-el-tiger-card-free-game-hack
    • http://perpustakaan-stikesmsb.com/repository/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/online-coin-master-free-spin-app_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-skins-in-roblox_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-robux-for-free_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/roblox-login-hack_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/roblox36com-free-robux_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spins-11-01-2021_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spin-and-trading-group_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/free-accessories-roblox_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-robux-without-email_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/robux-com-free_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/free-robux-hacker-us_GM431946152.pdf
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-cards-link-2021_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/freespinandcoin-blogspot_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/coin-master-hack-pro-gamers-com_GM406889139.pdf
    • http://perpustakaan-stikesmsb.com/repository/is-roblox-free-on-xbox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a00.bin
b195c338ed3b04024dad5f4a9488ed8e3afaefdb2bc9bd974a31a99edebadce0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A00 24848 bytes
font_01_sfnt_off000082cf.bin
c067a8d9b94428a837d731c152139179b4b3f31d2cf3c42d1e3bf69684e59446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CF 4200 bytes
font_02_sfnt_off000090e5.bin
62951dc56a4098348a942f01ff7d9064ef2b90491a118746803c45398ddf7514		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E5 18244 bytes

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