Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23e79b949fb45ea…

MALICIOUS

PDF

45.3 KB Created: 2021-06-11 02:40:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e0437737c87310dd3ef92fac49e65b6d SHA-1: 79861ca776a3a76196163461e837fa2bdfefe719 SHA-256: e23e79b949fb45ea29177919e18cdd447208353d27af10d06803ecf4aaecaae9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on 'santeh-40.ru' and offer downloads related to popular games like Roblox and Coin Master, often with terms like 'hack' or 'free'. The presence of a PDF URI heuristic and the ML classifier's high confidence score indicate malicious intent. The document body and extracted URLs suggest a lure for users seeking in-game advantages, which could lead to the download of malware or unwanted applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/easy-no-survey-free-robux-game-hack
    • http://santeh-40.ru/images/hack-coin-master-apk-32-download_GM406889139.pdf
    • http://santeh-40.ru/images/roblox-online-free_GM431946152.pdf
    • http://santeh-40.ru/images/free-robux-generator-codes_GM431946152.pdf
    • http://santeh-40.ru/images/coin-master-apk-mod-free-download_GM406889139.pdf
    • http://santeh-40.ru/images/minecraft-free-trial_GM479516143.pdf
    • http://santeh-40.ru/images/coin-master-claim-free-spins_GM406889139.pdf
    • http://santeh-40.ru/images/free-robux-no-verification-required_GM431946152.pdf
    • http://santeh-40.ru/images/coin-master-free-daily-spins_GM406889139.pdf
    • http://santeh-40.ru/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • http://santeh-40.ru/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://santeh-40.ru/images/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://santeh-40.ru/images/oprewards-free-robux_GM431946152.pdf
    • http://santeh-40.ru/images/coin-master-download-hack_GM406889139.pdf
    • http://santeh-40.ru/images/robux-earning-websites_GM431946152.pdf
    • http://santeh-40.ru/images/how-to-get-free-coins-in-minecraft_GM479516143.pdf
    • http://santeh-40.ru/images/buy-free-robux-roblox_GM431946152.pdf
    • http://santeh-40.ru/images/best-way-to-get-free-robux_GM431946152.pdf
    • http://santeh-40.ru/images/free-robux-com-no-verification_GM431946152.pdf
    • http://santeh-40.ru/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://santeh-40.ru/images/is-it-possible-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000535a.bin
4a0f99c8734a0f3b21924ea90b10eaea24c0fd759857b58b1ba20733e1f838b6
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x535A 26016 bytes
font_01_sfnt_off00008dd2.bin
c212b1036c0c6dfdf2d40f386b32565df2834b3c77969850f9674190a73d57ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD2 18536 bytes