Malicious PDF — malware analysis report

Static analysis result for SHA-256 439f9c2175d0a691…

MALICIOUS

PDF

43.1 KB Created: 2021-05-11 02:30:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0af18dc469b4b56313699222f96e68a7 SHA-1: 90effb97eff867bdda4c99b44b349a0153f41c40 SHA-256: 439f9c2175d0a6917027115dc281a8a6de5afe80051f65f792178da6f6d3085c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to domains associated with link farms and potentially malicious content, such as game hacks and free spins. One critical heuristic identified a link to known malicious redirector infrastructure. The document body also contains a direct URL that appears to be a lure for downloading an application. These findings indicate a phishing or scam attempt designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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
  • 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/479516143/minecraft-pe-apk-download-free-0.15-0-game-hack In PDF document text
    • https://repository.stikesindramayu.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/robux-now_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/codes-how-to-get-free-robux_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_003_off00004a28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A28 24972 bytes
SHA-256: 113f499fa2f72aac2aa063752fdeaac4122c8113721abc118a72da8368ce0e65
font_01_sfnt_off0000831d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x831D 19268 bytes
SHA-256: 28dc74618e8b02129b424bb36b85fc5c3aa5d44cc182401491d55e46ac5e52ed

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