Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c25a930da594c4…

MALICIOUS

PDF

47.6 KB Created: 2021-06-09 03:05:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5e71388bb947ff52ff2e411c4f516326 SHA-1: 50a90fbc5e6ee6ea1aefa8a4b74a03ad07e68f52 SHA-256: 75c25a930da594c44493869763b6685e9db388d06bcf683fc66a3e6739c9df55
102 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified as a link farm, all pointing to websites offering free in-game currency or hacks for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download' button lure further supports a malicious intent. The document likely serves as a lure to redirect users to potentially malicious sites or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/free-roblox-for-roblox-game-hack PDF link annotation
    • https://verstricktundzugenaeht.com/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/pokemon-go-free-and-switch-connect_GM1094591345.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/denis-free-robux_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/roblox-guess-the-song-cheats_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F4 27072 bytes
SHA-256: 83ad508a36eee976128756ce76eee734964d90e8689400cf3aaff61590630218
font_01_sfnt_off00008e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E40 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off0000983d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x983D 17948 bytes
SHA-256: abd46f863f925739c6779ba87e0350ce04166d926cbd983fd5dc50e2b294e41e

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