Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a032f07e8e9086f…

MALICIOUS

PDF

34.5 KB Created: 2021-06-28 03:16:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4e262f6450a11b6c224068e53b30d317 SHA-1: 95fea2fc971dbcc6adaee6e6f043de56b7af8097 SHA-256: 2a032f07e8e9086f929f5b44fbe9b790db03074279e5f24ad0eb665ea621f7cc
122 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm. The document body and extracted URLs indicate a lure for free in-game currency (Robux, Coin Master), likely to trick users into downloading malware or visiting malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt.

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.co/app/431946152/como-hackear-robux-con-cheat-engine-game-hack
    • https://tecturatw.com/image/data/files/free-robux-gen_GM431946152.pdf
    • https://tecturatw.com/image/data/files/coin-master-free-spins-23-march-2021_GM406889139.pdf
    • https://tecturatw.com/image/data/files/how-to-get-free-robux-instantly_GM431946152.pdf
    • https://tecturatw.com/image/data/files/free-robux-obbys-that-work_GM431946152.pdf
    • https://tecturatw.com/image/data/files/coin-master-latest-mod-apk-free-download_GM406889139.pdf
    • https://tecturatw.com/image/data/files/robux-generator-no-human-verification_GM431946152.pdf
    • https://tecturatw.com/image/data/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://tecturatw.com/image/data/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdf
    • https://tecturatw.com/image/data/files/www-roblox-com-free-robux_GM431946152.pdf
    • https://tecturatw.com/image/data/files/get-free-robux-without-human-verification_GM431946152.pdf
    • https://tecturatw.com/image/data/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • https://tecturatw.com/image/data/files/free-minecraft-bedrock-server-hosting_GM479516143.pdf
    • https://tecturatw.com/image/data/files/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • https://tecturatw.com/image/data/files/robux-get-com_GM431946152.pdf
    • https://tecturatw.com/image/data/files/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • https://tecturatw.com/image/data/files/freespinandcoin_GM406889139.pdf
    • https://tecturatw.com/image/data/files/free-coin-and-spin-in-coin-master_GM406889139.pdf
    • https://tecturatw.com/image/data/files/free-daily-spins-coin-master-2021_GM406889139.pdf
    • https://tecturatw.com/image/data/files/minecraft-free-apk-java-edition_GM479516143.pdf
    • https://tecturatw.com/image/data/files/coin-master-free-coins-and-spins-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003190.bin
1dcaa0ac391d729aa805366f5113b9806c3481274eb59445c7177fd58b31c99e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3190 21672 bytes
font_01_sfnt_off000060e5.bin
9260076601be97992726180a027d6ca983d29485aa6e5af71cba08dd4f774dc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E5 19372 bytes

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