Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b7d27c08d40d39…

MALICIOUS

PDF

34.2 KB Created: 2021-07-09 17:48:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a995ced4c1061dce1333be5d5a012b3f SHA-1: 3545f0e82464e17bc7ecf751ad494d95cec731f0 SHA-256: 51b7d27c08d40d39fa548df6c5e4e766ba7d2dd7ad3d638472e1d009ff88c5d1
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF link farms. The document body and extracted URLs suggest a lure for free in-game currency (Robux, Coin Master) or hacks, likely leading to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links indicates a potential attempt to direct users to phishing or malware distribution sites.

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/431946152/free-robux-rewards-game-hack
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/roblox-robux-hack-cheat-engine_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-robux-human-verification_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/how-do-i-get-free-coins-in-coin-master_GM406889139.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/coin-master-free-gift-links-2021_GM406889139.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/officialrobuxhack-updated_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/how-to-hack-someones-minecraft-account_GM479516143.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-candy-van-roblox-hack_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-robux-with-private-group_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/monttechscom-coin-master-free-spins_GM406889139.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/invisible-hacke-roblox_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-member-roblox_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/free-robux-no-verification-no-download-2021_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/get-free-robux-now_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/www-rbxhut-com_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/cheat-engine-codes-roblox_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/files/roblox-free-exploits_GM431946152.pdf
    • https://daring.mtsn1lamsel.com/__statics/gudangsoal/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_off00003134.bin
5a4e159e55d77fbd429724c94771f7ba9045df158e0ac31174fa91558dc166ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3134 21516 bytes
font_01_sfnt_off00006060.bin
5fd868e4ea22638534696fb0cd66a74addf388445670d9d0517416fd5b37f315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6060 19056 bytes

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