Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c86f82319f5d2d…

MALICIOUS

PDF

33.6 KB Created: 2021-06-26 22:40:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2f2e4619cad9898f8107e83f00469120 SHA-1: c6fd72e7d0b3a007660954be0f2a1f6f374b8a0c SHA-256: 07c86f82319f5d2d3ae51fecdb3edd7030e5dbec08011956541722b86b94a0b3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a 'doc body' excerpt that explicitly advertises hacks and generators for games like Roblox and Coin Master, including a direct call-to-action. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'ML_NYX_PDF_MALICIOUS' suggests a high probability of malicious intent. The presence of embedded URLs and the nature of the content strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/roblox-sword-fighting-tournament-money-hack-game-hack PDF link annotation
    • https://knj.com.tw/image/data/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/cipherv3-roblox-exploit-rocky-hacks-and-more_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/funbloxxyz-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_off00002a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A30 22064 bytes
SHA-256: 35630b58a2a353eb900c009335e73075cfe651b72b4d0ada7e87fda5dc72073b
font_01_sfnt_off00005b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B14 20324 bytes
SHA-256: 3b7191df87f72347711af6269843cdd76ab506648a538b5f418eb13cf5a104a1

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