Malicious PDF — malware analysis report

Static analysis result for SHA-256 631f0b82baae44b6…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 07:46:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 427103a1526eb281f0b2780f9a0054e3 SHA-1: 6e2c0ffdf416fa3b3c709d5f8ebdfcfa5be40b03 SHA-256: 631f0b82baae44b621b0b969f9ca1b3ee9676559ba9e2d0615a67d4668dd2cf6
122 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or scam campaign, leveraging a popular game's name to attract users. It contains numerous external links, many of which point to other PDF documents, suggesting a link farm or a method to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.online/app/406889139/guide--coin-master-free-tips-game-hack
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-apk-facebook-login_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-in-arsenal_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-spins-for-coin-master-hack_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-minecraft-account-and-password-generator_GM479516143.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-easy_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-coins-link-2021-deutsch_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/card-hack-for-coin-master_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/hack-coin-master-no-verification_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-pro_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hack-app_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/earn-free-robux_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-daily-free-spin-app_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-roblox-card_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/daily-spin-and-coin_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/robux-free-promo-codes_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-robux-no-survey_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-pet-food-coin-master_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052f5.bin
e9afa275753606559c9d2fe2998bdb8cce599d8526283149be7442dcb8fb932b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F5 25112 bytes
font_01_sfnt_off00008a53.bin
9473af2ece6cba39163128d779c87c613bf9b715be2e9535b15bdecf1fdd6b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A53 18200 bytes

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