Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f34f6e67d70adbc…

MALICIOUS

PDF

46.4 KB Created: 2021-06-04 01:26:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e1f9f9d2ba0f30957d6752eee9eb9e0b SHA-1: af79e082749e29f3073efd9223516e0c957fb3cb SHA-256: 5f34f6e67d70adbc19519e617ba3206c14b2684299c8eb48f19917186fc4a040
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML_NYX_PDF_MALICIOUS heuristic also flagged the document with high confidence. The presence of embedded URLs and a call-to-action phrase further supports the malicious intent. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/free-spins-on-coin-master-app-game-hack
    • http://e-library.dharmawangsa.ac.id/repository/how-to-make-free-robux_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/microsoft-store-robux_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-free-ios_GM479516143.pdf
    • http://e-library.dharmawangsa.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spins-facebook_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/oprewards-com-roblox_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-without-survey_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/oprewards-free-robux_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/como-hackear-coin-master-gratis_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-skins-in-minecraft_GM479516143.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050b5.bin
7a1e012c121346b643fb5cc91a7a03b1ef7eb613b3a9ba31c2d88623a82f1b16		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B5 25436 bytes
font_01_sfnt_off000089fa.bin
30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FA 2840 bytes
font_02_sfnt_off000093ac.bin
e35eb77d1e434a4a4433bf7d50e70c108b9e33857f20e35365727ea7a7255123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93AC 17884 bytes

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