Malicious PDF — malware analysis report

Static analysis result for SHA-256 e184beb3900f8cdf…

MALICIOUS

PDF

48.7 KB Created: 2021-06-08 23:57:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2692f3cdc2eee13c4d19752e1b13fc7e SHA-1: 6c0cc52dbd0b7430b485abe1aa50009a59734785 SHA-256: e184beb3900f8cdf77109477b5daed4890401f36bc05144f8758f0234181fe4d
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 point to other PDF files hosted on the 'santeh-40.ru' domain. The document body and extracted URLs suggest a lure related to hacking games like Roblox and Coin Master, indicating a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/hack-roblox-prison-life-game-hack PDF link annotation
    • http://santeh-40.ru/images/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://santeh-40.ru/images/roblox-free-noneuy_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/how-to-hack-roblox-with-terminal_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://santeh-40.ru/images/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/free-robux-do-deals_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://santeh-40.ru/images/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://santeh-40.ru/images/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://santeh-40.ru/images/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000501f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501F 27116 bytes
SHA-256: debf9b50370ec0118b682bbd066cd82468e9058ec498b8d647a00b57f2783275
font_01_sfnt_off00008e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E20 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B31 18456 bytes
SHA-256: fdce39d00c747d81c0bed22602258809f3d5895638c77e0ae9c71d18352e143a