Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea1c55b54e90d922…

MALICIOUS

PDF

44.7 KB Created: 2021-05-16 23:38:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 001a2ff6eaa6b80e2a5c39109849649f SHA-1: f9902b7eedcaa81fdd199a3b32857301262f538e SHA-256: ea1c55b54e90d9226cd0c31b32961d71c9af81be87e67edea4b4215ed33babeb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that form a link farm, suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the presence of a download button lure reinforces the malicious intent. While no scripts were directly extracted, the structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/robux-com-roblox-game-hack
    • http://atmos-service.com/images/robux-converter_GM431946152.pdf
    • http://atmos-service.com/images/how-do-you-get-free-robux-2021_GM431946152.pdf
    • http://atmos-service.com/images/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://atmos-service.com/images/coin-master-free-spin-now_GM406889139.pdf
    • http://atmos-service.com/images/free-robux-generator-2021-no-survey_GM431946152.pdf
    • http://atmos-service.com/images/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://atmos-service.com/images/free-robux-generator_GM431946152.pdf
    • http://atmos-service.com/images/free-private-server-roblox_GM431946152.pdf
    • http://atmos-service.com/images/coin-master-daily_GM406889139.pdf
    • http://atmos-service.com/images/free-coins-and-spins-in-coin-master_GM406889139.pdf
    • http://atmos-service.com/images/how-to-get-free-roblox-premium_GM431946152.pdf
    • http://atmos-service.com/images/coin-master-daily-free-cards_GM406889139.pdf
    • http://atmos-service.com/images/free-spin-coin-master-game_GM406889139.pdf
    • http://atmos-service.com/images/roblox-robux-generator_GM431946152.pdf
    • http://atmos-service.com/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://atmos-service.com/images/robux-hack-free-robux_GM431946152.pdf
    • http://atmos-service.com/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdf
    • http://atmos-service.com/images/how-to-get-free-outfits-on-roblox_GM431946152.pdf
    • http://atmos-service.com/images/coin-master-hack-tool-download_GM406889139.pdf
    • http://atmos-service.com/images/free-robux-no-verification-needed_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047f5.bin
587929a7c07c74107833ae3207af3be1f7a763d93b0ab9535e7b383aaf6f89bf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47F5 24768 bytes
font_01_sfnt_off0000813b.bin
4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813B 3400 bytes
font_02_sfnt_off00008c64.bin
f7ab4603df043e3b409a5778cbcaa649af363bace0b439e4e1e45451ac3c723c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C64 18184 bytes

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