Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d99858d5f54cadd…

MALICIOUS

PDF

46.3 KB Created: 2021-05-11 15:40:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 90222f4351d7ec75191c827cdfae9a68 SHA-1: 59a7272dfd74986fdf0c5cc2fbf880ff3f411205 SHA-256: 1d99858d5f54cadd5f4852bfcfc571b973d1fdc05238cbfa9cde1adc8b56320f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which are related to "Robux" and "Coin Master" hacks, suggesting a lure for users seeking cheats or exploits. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and the ML_NYX_PDF_MALICIOUS score further supports its malicious nature. The presence of a download button lure reinforces the intent to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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.xyz/app/431946152/robux-hack-free-robux-game-hack PDF link annotation
    • https://ethraa.ae/userfiles/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://discordIn 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_003_off00004aad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AAD 25340 bytes
SHA-256: fbf7a4a6e03a61d2a4c1bc25866a2bca9711c6db3972c4cf016b597d3a51d4b0
font_01_sfnt_off0000851d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x851D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000922e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x922E 18412 bytes
SHA-256: e7ad190f023b5a59f82d5d2304e728b1fb84096fbbeb22520bbc212286f43b51

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