Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ba9cb8d7581924…

MALICIOUS

PDF

44.7 KB Created: 2021-05-16 07:30:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 530b1e6a154ddcf13d74a52f2ccbb132 SHA-1: e4b548eb08bbf98c1c76399acdd1b669f8393d75 SHA-256: 25ba9cb8d75819240ce534208c5ea067b726d2bd88a6aa4ff085fb2573790ba9
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 SEO-optimized and point to pages offering game hacks and free spins, 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 a callback lure further supports a malicious intent, likely to direct users to download malware or engage in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/master-coin-hack-mod-game-hack
    • http://lamascheradiferro.dk/images/300-daily-free-spins-coin-master_GM406889139.pdf
    • http://lamascheradiferro.dk/images/coin-master-heaven-free-spins-link_GM406889139.pdf
    • http://lamascheradiferro.dk/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://lamascheradiferro.dk/images/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://lamascheradiferro.dk/images/roblox-verification_GM431946152.pdf
    • http://lamascheradiferro.dk/images/download-hack-coin-master_GM406889139.pdf
    • http://lamascheradiferro.dk/images/free-robux-by-watching-ads_GM431946152.pdf
    • http://lamascheradiferro.dk/images/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://lamascheradiferro.dk/images/how-do-you-get-free-coins-in-coin-master_GM406889139.pdf
    • http://lamascheradiferro.dk/images/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdf
    • http://lamascheradiferro.dk/images/how-to-hack-someones-roblox-account_GM431946152.pdf
    • http://lamascheradiferro.dk/images/free-robux-games-on-roblox_GM431946152.pdf
    • http://lamascheradiferro.dk/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://lamascheradiferro.dk/images/free-spin-appscoin-master_GM406889139.pdf
    • http://lamascheradiferro.dk/images/500-free-spins-coin-master_GM406889139.pdf
    • http://lamascheradiferro.dk/images/free-robux-that-actually-works-2021_GM431946152.pdf
    • http://lamascheradiferro.dk/images/is-minecraft-education-edition-free_GM479516143.pdf
    • http://lamascheradiferro.dk/images/coin-master-free-spins-2021-haktuts_GM406889139.pdf
    • http://lamascheradiferro.dk/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://lamascheradiferro.dk/images/robux-hack-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b34.bin
dab7b94f7cd708d4303b32e45d43d70dcd3d80337df8a55e6ec74fc7bf9a01c8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B34 24984 bytes
font_01_sfnt_off00008345.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8345 2880 bytes
font_02_sfnt_off00008d30.bin
79663f5c6e364485b04b83db578590d29b6e1ee38eddb5c45b054f63581374ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D30 17888 bytes

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