Malicious PDF — malware analysis report

Static analysis result for SHA-256 626c6943a7cdbd52…

MALICIOUS

PDF

35.6 KB Created: 2021-06-29 21:15:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7a5e69f03eb3a300f20dbfef23319af8 SHA-1: 3d9908850cdffacaf0a7e1fde4df782f7ffc590d SHA-256: 626c6943a7cdbd52e3a0b99c4424ba3ef58a4e785c076ca8905279d083865cd4
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a document body that promotes free Robux and Coin Master cheats, indicating a lure for users to click on these links. The heuristic 'PDF_SEO_LINK_FARM' and the ML classification strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a call-to-action phrase further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/whats-a-code-for-roblox-to-get-free-robux-game-hack PDF link annotation
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-roblox-adopt-me-bucks-cheat_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/cheat-sur-roblox-plus-robux_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-to-get-hacks-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/down-load-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-unlimited-robux-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/can-pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/pubg-uc-png_GM1330123889.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/how-to-get-free-money-in-restaurant-tycoon-roblox_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/hack-in-roblox-to-unlock-elemental-dragon_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/error-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://www.cityonlinestores.com/uploaded_files/userfiles/files/roblox-sexually-abused_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_off00003222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3222 22632 bytes
SHA-256: ac622d61ae18034c3aaab3a1549bb745a80f798348509042c04f35180794aae1
font_01_sfnt_off000064d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D7 19432 bytes
SHA-256: 6f5bab9fd22258bdb927fb2b0bca339f15bf35837a33a268fb173cde1456ba9f

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