Malicious PDF — malware analysis report

Static analysis result for SHA-256 71356ff1fde81ab3…

MALICIOUS

PDF

45.3 KB Created: 2021-06-11 05:53:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3168eeca757f5e83f9254be00a73728c SHA-1: beb263419b855e5bbc9089c16cca45109f23d26f SHA-256: 71356ff1fde81ab3b05375f85a4410aa5fbbe91931c10b019708b065519ec0a5
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 'PDF_SEO_LINK_FARM' heuristic, pointing to various websites offering game-related cheats and free items. The document body also contains a primary URL related to hacking Roblox accounts. These elements strongly suggest a social engineering or phishing attempt designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/how-to-hack-your-own-roblox-account-game-hack
    • http://bgnails.nl/images/free-catalog-stuff-in-roblox-2021_GM431946152.pdf
    • http://bgnails.nl/images/free-robux-no-verification-required_GM431946152.pdf
    • http://bgnails.nl/images/free-robux-generator-no-verification_GM431946152.pdf
    • http://bgnails.nl/images/claim-roblox_GM431946152.pdf
    • http://bgnails.nl/images/roblox-credit-card-payment-download-free_GM431946152.pdf
    • http://bgnails.nl/images/how-to-get-100-robux-for-free_GM431946152.pdf
    • http://bgnails.nl/images/free-tiktok-followers-no-downloads_GM835599320.pdf
    • http://bgnails.nl/images/roblox-inappropriate_GM431946152.pdf
    • http://bgnails.nl/images/minecraft-free-download-apk-softonic_GM479516143.pdf
    • http://bgnails.nl/images/coin-master-download-hack_GM406889139.pdf
    • http://bgnails.nl/images/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://bgnails.nl/images/free-coin-master-spins-for-today_GM406889139.pdf
    • http://bgnails.nl/images/coin-master-free_GM406889139.pdf
    • http://bgnails.nl/images/smurfs-backpack-gives-free-robux_GM431946152.pdf
    • http://bgnails.nl/images/free-robux-youtube_GM431946152.pdf
    • http://bgnails.nl/images/roblox-face-png-free_GM431946152.pdf
    • http://bgnails.nl/images/hacks-for-roblox-prison-life_GM431946152.pdf
    • http://bgnails.nl/images/coin-master-email-free-spins_GM406889139.pdf
    • http://bgnails.nl/images/coolest-free-roblox-characters_GM431946152.pdf
    • http://bgnails.nl/images/free-robux-hacks-no-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d0.bin
65f4a6d3e33ccde5dd40fb5102c8040f79ba8e64d5764b622e868e0cffc24709
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D0 25524 bytes
font_01_sfnt_off00008cdf.bin
7c61f728da21bf046a9889425e417e933f2af0985b682232526ddb4e8a28ef99
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDF 18752 bytes