Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff77ed47f73663e…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 13:33:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: dfb30bbb493914300257d66c21b674cf SHA-1: 53156eaaf867e4b7642fdd510d79a3ad1c33bd83 SHA-256: 7ff77ed47f73663e6089f09ea245c000fbb76c9c1b30601773a549286975e532
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are related to game hacks and free in-game currency for popular games like Coin Master and Roblox. The presence of a "link farm" heuristic and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest it's designed to facilitate initial access through deceptive links.

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.
  • 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/how-to-get-stuff-that-cost-coins-free-mcpe-master-game-hack
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-roblox-mgui_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/how-to-get-minecraft-for-free-ios_GM479516143.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-robux-no-survey-no-download-no-human-verification_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-free-coins-and-spins-app_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/minecraft-tiktok-hacks_GM479516143.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/card-hack-in-coin-master_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/hack-roblox-players_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/coin-master-hack-for-android_GM406889139.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/free-robux-tech_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/roblox-hack-in-2021_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/i-need-free-robux-now_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/siri-how-do-you-get-free-robux_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/hack-devil-fruit-one-piece-roblox_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/roblox-robux-hack-no-survey-2021_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/is-the-roblox-builders-club-free_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdf
    • http://cpsad.adturekorea.co.kr/newboard/_upload/userfiles/files/roblox-blood-of-iron-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032d5.bin
c312312046e83b6cf6f1fa01307ec1cf462ce27c1bd75a612463b8788cd6c68c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32D5 22208 bytes
font_01_sfnt_off000063de.bin
27c5b0c493246218682d278be1d5b8350beffe41780a09c36db3607ad1c65035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DE 18644 bytes

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