Malicious PDF — malware analysis report

Static analysis result for SHA-256 c963cead87e7b79d…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 03:14:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 33b3f57a71cd43dd598da2db56ac731c SHA-1: 651a5a2f3926627377617ad7c04e52ed422fdfa9 SHA-256: c963cead87e7b79dc62831ad9d875d3087c06d3d6f2dd072dbc5179ae86b49e8
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, that point to websites offering free Robux and game hacks. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure further supports a malicious intent. The primary goal appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/games-on-roblox-that-give-you-free-robux-game-hack PDF link annotation
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-have-free-points-for-robux-in-oprewards_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/roblox-system_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/earnrobux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-generator-for-kids_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
font_00_sfnt_off000030fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30FA 22796 bytes
SHA-256: 53516db3ee6a35785a876acf7a7104d7a6594d5a713e75cab01f8e22ad2ce81c
font_01_sfnt_off000063e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E2 19716 bytes
SHA-256: 3217d2b45e6aba390097db31ed4f489c97a69b2175e2ab7441deb7edbbce2f2f

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