Malicious PDF — malware analysis report

Static analysis result for SHA-256 0049c3526229e343…

MALICIOUS

PDF

43.8 KB Created: 2021-06-09 06:04:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 62c22dbf421269d57ff51272bd3cf879 SHA-1: e2b88a3e5bc1204ef3e4dac638cb9aae7de8cbb4 SHA-256: 0049c3526229e343d6fc9f4ea56d6b22a9badafaf9673b06aea5deb2904a9fe6
102 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, including a high ML classification score and the presence of numerous external links, many of which are part of a link farm. The document body contains a URL that appears to be a lure for game-related cheats or hacks, and the PDF structure itself contains many links to other PDF files, suggesting a campaign to manipulate search results or distribute further malicious content. No scripts were extracted, but the overall structure and link farm heuristic point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/safe-cheat-ml-roblox-game-hack
    • http://karldall.dk/images/static-moonactive-net_GM406889139.pdf
    • http://karldall.dk/images/free-minecraft-java-account_GM479516143.pdf
    • http://karldall.dk/images/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • http://karldall.dk/images/free-robux-without-verification-2021_GM431946152.pdf
    • http://karldall.dk/images/how-to-get-free-clothes-in-the-catalog-on-roblox_GM431946152.pdf
    • http://karldall.dk/images/coin-master-free-spins-gratis_GM406889139.pdf
    • http://karldall.dk/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdf
    • http://karldall.dk/images/easy-way-to-get-free-robux_GM431946152.pdf
    • http://karldall.dk/images/coin-master-free-daily-spins_GM406889139.pdf
    • http://karldall.dk/images/coin-master-daily-bonus-hack_GM406889139.pdf
    • http://karldall.dk/images/coin-master-play-online-free_GM406889139.pdf
    • http://karldall.dk/images/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://karldall.dk/images/coin-master-golden-card-hack_GM406889139.pdf
    • http://karldall.dk/images/free-spins-coins-coin-master_GM406889139.pdf
    • http://karldall.dk/images/more-robux_GM431946152.pdf
    • http://karldall.dk/images/robux-no-verification_GM431946152.pdf
    • http://karldall.dk/images/free-coin-master-gifts_GM406889139.pdf
    • http://karldall.dk/images/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • http://karldall.dk/images/free-minecraft-games-for-kids_GM479516143.pdf
    • http://karldall.dk/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ec9.bin
034d676b8f62663ef30cee7c0c40268a19f78e3429164952b1d1d24699a82210
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC9 25268 bytes
font_01_sfnt_off0000880c.bin
8de75e33b3892fc0cef5d8ca92dc63f1efeadfa94d41cca04f8d5f8112f3b1fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x880C 18480 bytes