Malicious PDF — malware analysis report

Static analysis result for SHA-256 914ef32af18c7ad3…

MALICIOUS

PDF

43.7 KB Created: 2021-05-14 15:35:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8c464d19db72fdd3d9e498dc358c8cfe SHA-1: 2102bf210862e6d3f0f5497289a787652c290767 SHA-256: 914ef32af18c7ad3256756efc5c12f5879bc81ee2ac557ba270a3aeed12ca62d
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to other PDF files, indicating a link farm or SEO spamming operation. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further suggests a lure to click these links. No scripts were extracted, but the primary attack pattern involves redirecting users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-free-daily-spins-and-coins-game-hack
    • https://www.ocic.hr/files/free-robux-generator-without-verification_GM431946152.pdf
    • https://www.ocic.hr/files/coin-master-free-spin-codes_GM406889139.pdf
    • https://www.ocic.hr/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • https://www.ocic.hr/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdf
    • http://www.ocic.hr/files/coin-master-hack-2021-apk_GM406889139.pdf
    • http://www.ocic.hr/files/free-spins-coin-master-2021-glitch_GM406889139.pdf
    • https://www.ocic.hr/files/how-many-villages-are-in-coin-master_GM406889139.pdf
    • https://www.ocic.hr/files/roblox-free-no-download_GM431946152.pdf
    • http://www.ocic.hr/files/roblox-robux-generator-no-human-verification_GM431946152.pdf
    • https://www.ocic.hr/files/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://www.ocic.hr/files/robux-free-c_GM431946152.pdf
    • https://www.ocic.hr/files/robux-hack-2021_GM431946152.pdf
    • https://www.ocic.hr/files/get-me-robux-for-free_GM431946152.pdf
    • http://www.ocic.hr/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdf
    • http://www.ocic.hr/files/wurst-112_GM479516143.pdf
    • http://www.ocic.hr/files/free-coin-master-spins-blog_GM406889139.pdf
    • http://www.ocic.hr/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdf
    • https://www.ocic.hr/files/robux-today_GM431946152.pdf
    • http://www.ocic.hr/files/what-do-roblox-points-do_GM431946152.pdf
    • https://www.ocic.hr/files/coin-master-hack-apk-35-13_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049dd.bin
b124679077d4be07dfb16ec1f0c1ae9ed50c26f8546a3c86d1faba4c2434d022
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DD 28828 bytes
font_01_sfnt_off000087f0.bin
88c5a76ee56cb7e28b06cf9e90949f5a0fd4a72b6dddac6cb3c8c84aebf5620b
pdf-font-stream PDF embedded font (sfnt) at offset 0x87F0 18480 bytes