Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82c5f20f1404003…

MALICIOUS

PDF

48.6 KB Created: 2021-06-08 23:32:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: df069359a7d92006dc1823a7d8858614 SHA-1: 03bc7fdfaea4f9855c5d51b4a9b8c5f04dc48625 SHA-256: e82c5f20f14040035b18af9ba751a8b83d8ff21f2f534cfbe9e4fabea156d2a7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, identified as a 'PDF_SEO_LINK_FARM' heuristic, directing users to websites promising game-related cheats and currency. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'visual download button' lure further suggests an attempt to trick users into clicking these links, likely leading to phishing or malware.

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/free-robux-no-human-verification-or-survey-ios-game-hack PDF link annotation
    • https://lib.unitri.ac.id//repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-mad-city-cheat-to-kick-people_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/grabpoints-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/tiktok-for-free-download_GM835599320.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-clothes-with-codes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-coin-master-spin-apk_GM406889139.pdfIn 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_off0000550d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x550D 25384 bytes
SHA-256: 6c2ba97ce83e62d8c7725167216fc1217d606080b4d3e31a5904f6d4a07f3a39
font_01_sfnt_off00008eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEC 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000098ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98AE 19156 bytes
SHA-256: 92a8ac4c51bcc01ab0657839d05da411e056a3863c86b327cd12e1cc492e0c2a

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