Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd044ca76bc93ef…

MALICIOUS

PDF

41.8 KB Created: 2021-05-17 09:10:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b60f520d745c5c0ca13b949dc646c29a SHA-1: a9598fc15e9315b22b228a36d57fea56b9ad4c18 SHA-256: efd044ca76bc93ef8e91043b86b73cf698493f3f9e3fc5d49a9a924f3e560f10
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are structured as a link farm for SEO purposes, pointing to sites offering hacks and free in-game currency. The primary URL in the document body, https://netcdn.xyz/app/406889139/coin-master-hack-mod-apk-unlimited-spin-download-game-hack, suggests a lure for downloading a modified application. The presence of a visual download button further reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-hack-mod-apk-unlimited-spin-download-game-hack PDF link annotation
    • https://reggieslockandkey.com/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-website_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-robux-human-verification_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_off00004897.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4897 23992 bytes
SHA-256: 07fd9bc528296f4d0605ab3eb41d5bc38b215b07d6199b1c2d57b3ba4b7c2b39
font_01_sfnt_off00007f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F34 18916 bytes
SHA-256: 235aea5ebbb4512cfbc9f8a1b45f63981b2319364ea35e3ec6b5ee3ddf49ad62

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