Malicious PDF — malware analysis report

Static analysis result for SHA-256 b833cb6f19d42a26…

MALICIOUS

PDF

46.3 KB Created: 2021-05-15 12:47:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f3c432d3aeaef0616be4b34f2024baa7 SHA-1: 271c544f6931fc94e6b420bcde4862ad002f889c SHA-256: b833cb6f19d42a267630c90b62200fa31a42b442994c804687ce374f99aceda7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which are structured as SEO-optimized slugs pointing to game-related content like hacks and cheats. The ML classifier also flagged this PDF as malicious. The presence of a call-to-action phrase and the overall structure suggest an attempt to trick users into visiting malicious sites or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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/roblox-heroes-online-game-hack
    • https://jdlgroup.ca/images/coin-master-free-coins--spins_GM406889139.pdf
    • https://jdlgroup.ca/images/minecraft-free-download-chromebook_GM479516143.pdf
    • https://jdlgroup.ca/images/apps-for-free-robux_GM431946152.pdf
    • https://jdlgroup.ca/images/coin-master-cheats-without-verification_GM406889139.pdf
    • https://jdlgroup.ca/images/free-coin-master-spins-and-coins_GM406889139.pdf
    • https://jdlgroup.ca/images/free-robux-giveaway-live_GM431946152.pdf
    • https://jdlgroup.ca/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdf
    • https://jdlgroup.ca/images/coin-master-free-shield-link_GM406889139.pdf
    • https://jdlgroup.ca/images/coin-master-2021-free-spins-link_GM406889139.pdf
    • https://jdlgroup.ca/images/inappropriate-roblox-games-2021_GM431946152.pdf
    • https://jdlgroup.ca/images/minecraft-account-hacked_GM479516143.pdf
    • https://jdlgroup.ca/images/coin-master-game-free-download-for-pc_GM406889139.pdf
    • https://jdlgroup.ca/images/roblox-hack-com_GM431946152.pdf
    • https://jdlgroup.ca/images/todays-free-spin-and-coin-links_GM406889139.pdf
    • https://jdlgroup.ca/images/free-robux-no-human-verify_GM431946152.pdf
    • https://jdlgroup.ca/images/how-to-get-free-robux-games_GM431946152.pdf
    • https://jdlgroup.ca/images/free-roblox-codes_GM431946152.pdf
    • https://jdlgroup.ca/images/how-to-get-minecraft-for-free-ios_GM479516143.pdf
    • https://jdlgroup.ca/images/free-coins--spins-coin-master_GM406889139.pdf
    • https://jdlgroup.ca/images/free-robux-without-verification-or-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a95.bin
d054862cd878808330e0792e4a01bab4fe04a519dee389a8529b231d6d3219d8
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A95 24296 bytes
font_01_sfnt_off00008231.bin
f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
pdf-font-stream PDF embedded font (sfnt) at offset 0x8231 7272 bytes
font_02_sfnt_off000093a2.bin
b7f11a2df82e7930abe2842f58c991707f2f159cab445d86aa6820b01792cbd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x93A2 17904 bytes