Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9c9ab741350802…

MALICIOUS

PDF

46.9 KB Created: 2021-06-11 13:29:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 93fe4cb736bb624a4149f1aa6c856378 SHA-1: f0c45318529a7a9f0e6973c4f49cddbc614e1dd3 SHA-256: 1a9c9ab741350802f06ecb2873f35944db7e0e8b500707f88127928c396b80d5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'Roblox' and 'cheats', suggesting a lure for gamers. The presence of a visual download button further supports the malicious intent of directing users to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/les-commandes-d In PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-dbz-rage-cheats_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-robux-on-roblox-2021-not-clickbait_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-tix-roblox-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/google-moon-active_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B5 27164 bytes
SHA-256: 7691f30555903a7c0e65af76d9ab9b06f2837b49eb82690646ad83bde25f9fd0
font_01_sfnt_off000091e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91E5 19364 bytes
SHA-256: 92de747e5c749a0132e454aef938e81cd6709e27074310ade9ea152c0ed9ad01

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