Malicious PDF — malware analysis report

Static analysis result for SHA-256 c892833a038390b0…

MALICIOUS

PDF

44.0 KB Created: 2021-05-12 08:18:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b4aa75f8bc4da704d0f395880cb5e37d SHA-1: 45fe8f2faed038b68942934481a36c425990ebc5 SHA-256: c892833a038390b0dc739622d9fdb50271d968908d2f562590d6a118873e42fb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, many of which appear to be part of an SEO link farm. The document body also contains a direct URL to a suspicious domain, suggesting a lure for users to click through to potentially malicious content or downloads. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/406889139/claim-coin-master-free-spins-game-hack
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-2021-blogspot_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-link-today-facebook_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/roblox-hack-2021_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-link-today-new_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/coin-master-hack-apk-no-survey_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/free-robux-with-no-survey_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-hack-download-ios_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/robux-online_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-robux-codes_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/free-roblox-boy-hair_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/get-more-free-spins-on-coin-master_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/mobihack-net-roblox-hack_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-hack-tool-access-online-generator_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdf
    • http://repository.ummy.ac.id//repository/roblox-girl-avatar_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/how-do-we-get-free-robux_GM431946152.pdf
    • http://repository.ummy.ac.id//repository/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://repository.ummy.ac.id//repository/coin-master-hack-spins-ios_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004be7.bin
1bb2ff7ccd5a4d7a636ba96b2a76c1aad09a17de1ddf4f34ee62ada519e566e8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE7 28312 bytes
font_01_sfnt_off00008a02.bin
51400cf6f83d27ff8541fca55c054d9c932d538c26085d145cd133625b41aeb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A02 18220 bytes

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