Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a7ef4bdd3448a6…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 02:34:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c229aa827bea11cd3f2501f3554d5d45 SHA-1: c9c9c4efe710b7e89eca2db492f609a2ffa7ce70 SHA-256: 43a7ef4bdd3448a6ac6a01c62fb25f8c6dedfa8a8aed07023e802ed5c0e234fd
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, forming a link farm, that direct users to pages offering 'free spins' or 'hacks' for games like Coin Master and Roblox. The ML classifier strongly indicated maliciousness, and the presence of these links suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure designed to exploit user interest in game cheats.

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/get-free-spins-coin-master-2021-game-hack
    • http://www.sourcology.com/uploaded_files/userfiles/files/roblox-crashes-every-time-i-run-cheat-engine_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/coin-master-hack-apk-iphone_GM406889139.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/username-and-password-roblox-free_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/coin-master-free-spins-glitch_GM406889139.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/i-want-free-robux_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/free-spins-coin-master-links-no-human-verification_GM406889139.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/free-spin-and-coin_GM406889139.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/how-to-get-free-gear-in-roblox-2021_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/free-and-save-robux-haks_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/dragon-ball-rage-roblox-hack-tools_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/coin-master-hack-online-cheat_GM406889139.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/free-coins-for-coin-master_GM406889139.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/how-to-get-free-stuff-on-roblox-on-ipad_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/robux-hack-download-no-virus_GM431946152.pdf
    • http://www.sourcology.com/uploaded_files/userfiles/files/free-robux-no-human-verification-2021-ipad_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031b7.bin
7479aea159080e89c952471885b5fceb2e63173de60fd02aafe239b1940d51ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31B7 22668 bytes
font_01_sfnt_off0000642c.bin
47068641d4cd5afad495b2744cbb78709b2a1d88425159384b1e35df59296f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642C 18576 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.