Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3ed0241aa5cf31…

MALICIOUS

PDF

42.5 KB Created: 2021-05-17 08:11:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5f22d2810bb3461522782eab81a0c305 SHA-1: 1f4bbb721cd1b09c27f39a5a6af983c0b5c73a6b SHA-256: cf3ed0241aa5cf31a4d689a1e315cd466a60ac74f2a5fc291f99533c257df3fd
142 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a malicious lure, presenting a fake CAPTCHA or verification prompt to trick users into clicking embedded links. It contains a large number of SEO-optimized links, many of which point to game-related hacks, suggesting a phishing or scam campaign. The primary external URL, https://netcdn.xyz/app/431946152/roblox-premium-free-game-hack, is likely the intended destination for the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-premium-free-game-hack PDF link annotation
    • http://medinup.pt/images/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/roblox-lovenet_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
stream_003_off000048bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48BD 25672 bytes
SHA-256: ceeabc80029adc553288c71b3eb6f14f9509628c9f149786958108446762bf90
font_01_sfnt_off00008302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8302 18620 bytes
SHA-256: 29b072d58d5b3a55b665a3fffae90f40690866f16f9b518bc51084b043f759b6

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