Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c637b094bc1357…

MALICIOUS

PDF

45.7 KB Created: 2021-05-14 09:01:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3ac3c38c6eee4af95a11c87993e126ab SHA-1: 1df263215ef38957c6abd5142527c98369ca9f77 SHA-256: a7c637b094bc13572a45d5ffc000dfc2e1b272bfb47eadbdfde18ea293a682b1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure and a large number of external links, many pointing to other PDFs, suggesting a link farm designed to attract users searching for game cheats or generators. The ML classifier strongly indicated maliciousness, and the presence of numerous URLs associated with game hacks and generators points towards a phishing or scamming attempt. While no scripts were directly extracted, the structure and heuristics suggest the document is designed to lead users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-promo-codes-generator-no-human-verification-game-hack PDF link annotation
    • http://sbm-nn.ru/images/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-generator_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4779 31808 bytes
SHA-256: c26a5a3a1c3bcffa87ae516cae9657343bc8c2900425fb450279bfd74c86244d
font_01_sfnt_off00008dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFF 19100 bytes
SHA-256: da1745847f0d76ea82434fee3d569844ba056c0d901119001214af0940d395e7

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