Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29bb4036ef23ee4…

MALICIOUS

PDF

41.9 KB Created: 2021-05-17 21:20:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 90b297346c21c2e6fc36fa5aa4235b51 SHA-1: 03b4b4b0d085ebd12a359dea11c16f1db7950532 SHA-256: a29bb4036ef23ee48de8f80e4485933e1930cd482b267a76ccbd1452d9682071
102 Risk Score

Malware Insights

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

The PDF contains a large number of SEO-optimized links, many of which point to game-related hacks and cheats, suggesting a lure for users to download potentially malicious files. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to game hacks and URLs, reinforcing the lure. The presence of numerous external links, many with numeric slugs, indicates a link farm designed to attract search engine traffic.

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-no-download-game-hack
    • http://ff-obertraun.at/images/coin-master-free-spins-link-download-apk_GM406889139.pdf
    • http://ff-obertraun.at/images/hack-game-plus-com-coin-master_GM406889139.pdf
    • http://ff-obertraun.at/images/cm-daily-spins_GM406889139.pdf
    • http://ff-obertraun.at/images/minecraft-alt-accounts-free_GM479516143.pdf
    • http://ff-obertraun.at/images/how-to-hack-someones-roblox-account-2021_GM431946152.pdf
    • http://ff-obertraun.at/images/robux-free-gift-card-org-hack_GM431946152.pdf
    • http://ff-obertraun.at/images/coin-master-hack-apk-facebook-login_GM406889139.pdf
    • http://ff-obertraun.at/images/coin-master-hack-mod-game-download_GM406889139.pdf
    • http://ff-obertraun.at/images/free-arsenal-hacks_GM431946152.pdf
    • http://ff-obertraun.at/images/free-robux-no-survey-or-human-verification_GM431946152.pdf
    • http://ff-obertraun.at/images/free-minecraft-java-edition_GM479516143.pdf
    • http://ff-obertraun.at/images/roblox-svg-free_GM431946152.pdf
    • http://ff-obertraun.at/images/coin-master-hack-ios-app_GM406889139.pdf
    • http://ff-obertraun.at/images/whats-robux_GM431946152.pdf
    • http://ff-obertraun.at/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://ff-obertraun.at/images/links-for-coin-master-free-spins_GM406889139.pdf
    • http://ff-obertraun.at/images/coin-master-free-spin-27_GM406889139.pdf
    • http://ff-obertraun.at/images/orewards-com-free-robux_GM431946152.pdf
    • http://ff-obertraun.at/images/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdf
    • http://ff-obertraun.at/images/how-to-get-free-robux-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004866.bin
76f4f47a2d9eccf3a7b30ba139f0402fd843d6eb63648412448c7b0a38dadaee
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4866 24788 bytes
font_01_sfnt_off00008117.bin
b5e07150b2161f53c53a5a0ecf5e7f42140b65a1732b8c9e08245fa4e84c8ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8117 18296 bytes