Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72903811196d83d…

MALICIOUS

PDF

42.9 KB Created: 2021-05-19 22:15:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 19de844fc982d95107d82a80ff690e63 SHA-1: 55f9b629173ecadfe1cf9e473a7c59b07fce0864 SHA-256: b72903811196d83d1ab0ebd72ecaec49e2c206a10f9389dcf99b723a8d540a83
122 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as download pages for game hacks and cheats. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports a malicious intent to redirect users to potentially harmful content. The document body and extracted URLs suggest a lure for downloading unauthorized game modification tools.

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/app-for-free-spins-on-coin-master-game-hack PDF link annotation
    • http://safeandsecurelocksmith.ca/images/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/easy-robux_GM431946152.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://safeandsecurelocksmith.ca/images/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a6a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6A 26268 bytes
SHA-256: 23b1f43d4325eeb06aebc86f9b3796f3cca90b66c046e69abddad89746eea579
font_01_sfnt_off00008676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8676 17884 bytes
SHA-256: dc6c70fafb51a78ef12f4086d2953ccfccc8a264293bd4053977bb356e74e192

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