Malicious PDF — malware analysis report

Static analysis result for SHA-256 126cbbbdd4d18314…

MALICIOUS

PDF

34.6 KB Created: 2021-06-18 09:27:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 36fa8c1700d0795edd3b274e6e8dc81b SHA-1: 2d11ca83c9d088514e24169010c61838ca1a5a94 SHA-256: 126cbbbdd4d18314612d37e58047f707e3f03a7bfb115eb2c3d579d3c4a2dbbc
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/roblox-saiyan-simulator-hack-game-hack PDF link annotation
    • http://reggieslockandkey.com/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-get-free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/genarate-free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/free-roblox-exploits-v3rmillion_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-robux-with-guddinfo_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-change-your-roblox-username-for-free-no-email_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-to-fly-hack-in-roblox-lumber-tycoon_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://reggieslockandkey.com/images/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • https://reggieslockandkey.com/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/ssuper-speed-hack-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/how-to-get-free-chat-on-roblox_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/how-you-get-free-robux_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
font_00_sfnt_off00002ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECC 22584 bytes
SHA-256: 8f99ee9ffac672a28dd235cd89d91b1cbdecf6d61ed31e63b355b18517ace32a
font_01_sfnt_off0000616c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 19276 bytes
SHA-256: 647dc708ce48b4ed3f87159d0b848ec41c2bd8e313aeea2c0ea505290e2d7f20

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