Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf64dafb0136a37…

MALICIOUS

PDF

44.4 KB Created: 2021-05-16 04:46:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f87fba20d4e3e79d6db3f377488df923 SHA-1: 7c717ab9805dffca1b2af727771732184f7f544e SHA-256: edf64dafb0136a37bfeba1d34be834c15e8612713eba46c3fc1f58bc53816326
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to sites offering 'free Robux' or 'free spins' for games. This indicates a link farm designed to lure users to potentially malicious websites. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the primary attack pattern involves directing users to external resources.

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 https://netcdn.xyz/app/431946152/oprewards-free-robux-game-hack
    • https://www.dressel-immobilien-mv.de/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://www.dressel-immobilien-mv.de/images/coin-master-free-spins-link-ios_GM406889139.pdf
    • https://www.dressel-immobilien-mv.de/images/coin-master-code-for-free-spins_GM406889139.pdf
    • https://www.dressel-immobilien-mv.de/images/free-robux-without-verify_GM431946152.pdf
    • https://www.dressel-immobilien-mv.de/images/free-coin-master-coins_GM406889139.pdf
    • https://www.dressel-immobilien-mv.de/images/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • https://www.dressel-immobilien-mv.de/images/coin-master-hack-apk-no-survey_GM406889139.pdf
    • https://www.dressel-immobilien-mv.de/images/coin-master-heaven-free-spins-link-2021_GM406889139.pdf
    • https://www.dressel-immobilien-mv.de/images/how-to-hack-in-roblox-prison-life_GM431946152.pdf
    • https://www.dressel-immobilien-mv.de/images/how-to-o-get-free-coin-master-spins_GM406889139.pdf
    • https://www.dressel-immobilien-mv.de/images/roblox-army-free-robux_GM431946152.pdf
    • https://www.dressel-immobilien-mv.de/images/como-hackear-coin-master-2021_GM406889139.pdf
    • https://www.dressel-immobilien-mv.de/images/how-to-earn-free-stars-on-coin-master_GM406889139.pdf
    • https://www.dressel-immobilien-mv.de/images/free-spin-coin-master-hack-2021_GM406889139.pdf
    • https://www.dressel-immobilien-mv.de/images/free-robux-hack-no-verification_GM431946152.pdf
    • https://www.dressel-immobilien-mv.de/images/minecraft-xbox-360-free_GM479516143.pdf
    • https://www.dressel-immobilien-mv.de/images/how-to-get-free-robux-website_GM431946152.pdf
    • https://www.dressel-immobilien-mv.de/images/how-to-buy-robux-for-free_GM431946152.pdf
    • https://www.dressel-immobilien-mv.de/images/how-to-change-roblox-username-for-free_GM431946152.pdf
    • https://www.dressel-immobilien-mv.de/images/free-coin-master-spins-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049a7.bin
1583659b9c6dc41e119dfa86a175ca0dc3d55628357d81c3c6d9e9b93ef5d681
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49A7 28056 bytes
font_01_sfnt_off000089a0.bin
ea6a04d6c65882c9dd78ee7ca96c70e45062fdc6b69d68e2fcdc099d3abb6428
pdf-font-stream PDF embedded font (sfnt) at offset 0x89A0 18756 bytes