Malicious PDF — malware analysis report

Static analysis result for SHA-256 9975912d86df0ca4…

MALICIOUS

PDF

42.8 KB Created: 2021-05-15 17:01:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ef3e8eebf560e90651f930587a77075e SHA-1: 5074a7c82dbff8eea1ac97577bb9b36b50c0dfa7 SHA-256: 9975912d86df0ca4bba74af25361efe31eb6dbec2a7a20efc868d9ea95c8d875
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a document body referencing 'Free Robux' and game hacks, indicating a lure for users. The PDF_SEO_LINK_FARM heuristic firing suggests a large number of external links, likely to SEO-poisoned content or phishing sites. While no scripts were explicitly extracted, the presence of embedded URIs and the ML classifier's high confidence score point towards malicious intent, possibly for credential harvesting or malware distribution.

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/431946152/free-robux-site-game-hack
    • http://bernd-voehringer.de/images/how-can-you-get-free-robux_GM431946152.pdf
    • http://bernd-voehringer.de/images/coin-master-hack-apk-free-download_GM406889139.pdf
    • http://bernd-voehringer.de/images/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://bernd-voehringer.de/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • http://bernd-voehringer.de/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • http://bernd-voehringer.de/images/coin-master-fan-page-giveaway_GM406889139.pdf
    • http://bernd-voehringer.de/images/get-free-coin-master-coins_GM406889139.pdf
    • http://bernd-voehringer.de/images/free-spins-coin-master-2021_GM406889139.pdf
    • http://bernd-voehringer.de/images/link-coin-master_GM406889139.pdf
    • http://bernd-voehringer.de/images/minecraft-bedrock-client_GM479516143.pdf
    • http://bernd-voehringer.de/images/coin-master-pc-game-free-download_GM406889139.pdf
    • http://bernd-voehringer.de/images/my-minecraft-account-was-hacked_GM479516143.pdf
    • http://bernd-voehringer.de/images/links-for-free-spins-for-coin-master_GM406889139.pdf
    • http://bernd-voehringer.de/images/free-robux-android_GM431946152.pdf
    • http://bernd-voehringer.de/images/coin-master-mod-version-free-download-ios_GM406889139.pdf
    • http://bernd-voehringer.de/images/minecraft-xbox-one-code-free_GM479516143.pdf
    • http://bernd-voehringer.de/images/who-to-get-free-robux_GM431946152.pdf
    • http://bernd-voehringer.de/images/how-to-hack-coin-master-apkmody_GM406889139.pdf
    • http://bernd-voehringer.de/images/free-minecraft-premium-account_GM479516143.pdf
    • http://bernd-voehringer.de/images/www-roblox-com-robux-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004890.bin
5f103f1f2651473653907aae5b6b5ae56c3bb5e39298a53e55e57c58dc4042f9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4890 26712 bytes
font_01_sfnt_off00008532.bin
d17cd47be652198dd65b1182653c5b68eec39c9a25c2fe205f68dda680ae7be3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8532 18236 bytes