Malicious PDF — malware analysis report

Static analysis result for SHA-256 c747ea155545540b…

MALICIOUS

PDF

42.6 KB Created: 2021-05-16 15:48:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 306bd5503170dfd9e6567878c38618cd SHA-1: 542153d5114310bdc56eb103a89762b47e5aa53f SHA-256: c747ea155545540b4bd58dd899491bdce1dd17dc53a1567899824d15f8dcfc9a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a document body that promotes free game codes and items, indicative of a phishing or scam lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a large number of external links suggests a link farm designed to redirect users to potentially harmful sites. The document's primary function appears to be directing users to external resources via these links.

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/479516143/free-minecraft-codes-game-hack PDF link annotation
    • http://mechanism.gr/images/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/offers-for-robux_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/roblox-hax_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://mechanism.gr/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mechanism.gr/images/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://www.youtIn 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_off00004c7d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C7D 25088 bytes
SHA-256: 947d4971bd5a54a5c58ba86f8ca1b3f9755c9313578ed0b3c27d270fb81d8e93
font_01_sfnt_off00008569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8569 17884 bytes
SHA-256: ca0982e5699fcbbad1c272e9f6df792bd17b0fef580afa6f1747d77cedc77eee

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