Malicious PDF — malware analysis report

Static analysis result for SHA-256 9471c9b224ae8369…

MALICIOUS

PDF

48.9 KB Created: 2021-06-08 15:19:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0e987eeced7cd8e1640f96a6a4188284 SHA-1: 935190d1ed04824dad77d7efab2e2485cf28caa9 SHA-256: 9471c9b224ae836951fa0ccfdf6338b0cd606cc077baaaa11defea3ff56502d6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and a link farm, strongly suggesting a lure to external content. The document body and extracted URLs indicate a scam related to free in-game items for popular games. The ML classifier and PDF heuristics confirm the malicious nature of the document, likely serving as a delivery mechanism for further malicious content or scams.

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/how-to-get-a-free-skin-roblox-avatar-game-hack PDF link annotation
    • http://sbm-nn.ru/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.roblox.coIn 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_off00004ffe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FFE 26296 bytes
SHA-256: 5b51bd08a11db0e2e49c4adb01a020160af7862553b4dd0fc0a324202416a46b
font_01_sfnt_off00008db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB3 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC5 18848 bytes
SHA-256: d3204df688092d8ceee27d13f13ead439ed933f01e8c00bdfde24b529f9ba369

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