Malicious PDF — malware analysis report

Static analysis result for SHA-256 d451d91d3fac4a80…

MALICIOUS

PDF

37.5 KB Created: 2021-07-09 23:23:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5837a51475ba0dbadc0f75c2642a8aa1 SHA-1: 1889075e6a0d80280afe5515bc2cf2730ee467e9 SHA-256: d451d91d3fac4a8091be510c119abadfc53e322b18cddfaec4d43bf871aca227
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a primary URL that all point to sites offering game-related cheats, free spins, or hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of these lures suggests an attempt to trick users into downloading further malicious content or visiting compromised sites. No scripts were extracted, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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 http://netcdn.tw/app/406889139/coin-master-free-spins-11-01-2021-game-hack
    • http://www.callong.cn/uploaded_files/userfiles/files/free-roblox-birthday-invitations_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-roblox-card_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-2021-robux_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-working-robux-generator-no-survey_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-minecraft-for-kids_GM479516143.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/hack-para-dragon-ball-rage-roblox-2021-noviembre_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-dungeon-quest-money-hack_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-hack_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-on-phone_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-roblox-promo-codes-march-21-2021-twitter_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/get-free-roblox_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/claim-gg-free-robux_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/spins-coin-master_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/free-rare-cards-for-coin-master_GM406889139.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-unlimited-robux-2021_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-32-hack-apk-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003a6f.bin
b013d1a4e154286602b4b207d84b0b54474876c13822116d0d6e53e7e5cb4ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3A6F 23312 bytes
font_01_sfnt_off00006f14.bin
dc15c9aca5ee2f3edaf4f3f3393a78df3b5581a7d23d310761b394b7c3bd0baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F14 18576 bytes

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