Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0f9916d1fe2e90…

MALICIOUS

PDF

42.4 KB Created: 2021-05-19 11:21:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 86d9c22cf58217c8f8b1f426abcb8c52 SHA-1: c2433cbed177478d317d6da34f3d3eaba1bd1f70 SHA-256: 7b0f9916d1fe2e90c8798f5f428d97f86d190d898f801bde2080fda3951c2b48
122 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are related to game cheats and freebies, indicating a link farm or phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a download button lure and callback lure further supports a malicious intent to trick users into clicking links or potentially calling a number.

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.
  • 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.xyz/app/406889139/coin-master-free-spins-and-coins-for-today-game-hack
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-daily-free-spins_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/roblox-sued_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-get-roblox-premium-for-free_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-hack-roblox-games_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-hack_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-free-spins-2021_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-get-free-clothing-on-roblox_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/earn-free-spins-for-coin-master_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-robux-codes-2021-real_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-daily-spins-and-coins_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/hack-coin-master-online-without-human-verification_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-official-page_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/minecraft-for-free-games_GM479516143.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/ways-to-get-free-robux_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/how-do-you-get-free-roblox-money_GM431946152.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/coin-master-hack-online_GM406889139.pdf
    • http://www.ankitabrushes.com/uploaded_files/userfiles/files/free-robux-accounts_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ca8.bin
8cd3826f61d7bfd35fe3ced60d68ae4f79af508bbb98ab757c28d15ce4e8f3d1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA8 24096 bytes
font_01_sfnt_off0000838c.bin
3719491a9c8fefeea03f68de14e56d93a4ff097dba5adf71ae2e44f224446be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838C 18240 bytes

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