Malicious PDF — malware analysis report

Static analysis result for SHA-256 be71235427ec57da…

MALICIOUS

PDF

47.6 KB Created: 2021-06-08 22:25:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0feb8a1154d096aa446ea067f618de65 SHA-1: 8a3aeb1a4c3c8e28da8e317a43e09796a0f3d306 SHA-256: be71235427ec57da4c4102138ba2cbf5d4615968fd07e6924d361756c9c7e8c4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms. The document body and extracted URLs suggest a lure related to game hacks and free trials, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/your-life-free-trial-has-expired-roblox-game-hack
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-hack-apk-35-13_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-hack-no-survey_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/100-robux_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-robux-without-human-verification-real_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-get-free-spins-coin-master_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/pubg-uc-earning-app-in-pakistan_GM1330123889.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/toolbox-premium-apk_GM479516143.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/hack-coin-master-android-2021_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/get-free-coins-on-coin-master_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-spin-coin-master-link-2021_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-spin-in-coin-master_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-roblox-hack_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-free-spins-link-ios_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-spins-for-coin-master-app_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-get-free-robux-in-2021_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-minecraft-bedrock-server_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005292.bin
ff696010654af59d38d29e9a28423f92b01b2de0323b3f76fead4cab33d6ec46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5292 24620 bytes
font_01_sfnt_off00008b40.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B40 5596 bytes
font_02_sfnt_off000097e8.bin
897dd4cc3467943de2468ee115532ce4c2f625b0a31831d29ceca79b7b348238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E8 18948 bytes

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