Malicious PDF — malware analysis report

Static analysis result for SHA-256 30accd596a0a6ec0…

MALICIOUS

PDF

52.2 KB Created: 2021-06-07 13:06:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dc91b20b5b8e3df6c95188bf846a36da SHA-1: f0b2f78c2f0dec7bf4148ce1080fdb050faa2ae8 SHA-256: 30accd596a0a6ec0702e9269ea5e7cb7e14b9bf3c28cca15eeb1154b7a087af7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are structured as a link farm, suggesting a malicious intent to drive traffic or distribute further content. The document body and embedded links promote 'free Roblox accounts' and 'free Robux', a common lure for scams. While no scripts were explicitly extracted, the PDF structure and numerous external URLs strongly indicate a malicious workflow, likely involving redirection to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9464

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-account-giveaway-may-7th-2021-game-hack PDF link annotation
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-tiktok-free-followers_GM835599320.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-codes-no-verification-2021_GM431946152.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
font_00_sfnt_off0000558e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x558E 29384 bytes
SHA-256: 9e19dbd1c64ec94bc8198d6f71ed16c4bde50c75f16b90ece626d46f502a4bc8
font_01_sfnt_off00009846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9846 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000a4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4EE 19820 bytes
SHA-256: ddbe2810a2d4cf2f03c60e670ddab5a74b6a709e5e70782a4925a4d40c7677c0

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