Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea45ca71a125ce3…

MALICIOUS

PDF

33.5 KB Created: 2021-06-27 23:25:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5738e62a7aa34b235cf44c8ff5268a09 SHA-1: 9a535c54292b5aab7b9dc10914828e55a401aaca SHA-256: 1ea45ca71a125ce31fd3c8c63315efe9fc9ccb02168a8092552110fea4da15dd
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are SEO-optimized and point to sites offering free in-game currency or game downloads, a common lure for phishing or malware. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'Click here to download' phrase further supports a malicious workflow.

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/what-games-on-roblox-give-you-free-robux-game-hack PDF link annotation
    • https://3qblocks.com.tw/image/data/files/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/kann-man-in-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/rbx-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-freebies_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-x-club-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/nazi-roblox-hack_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/coin-master-free-daily-spins-and-coins_GM406889139.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_off00002ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD2 22120 bytes
SHA-256: 7825e1c6d21359e22b4723b957f635d2e1fcb73e9f3d8f5243b47a59a1961159
font_01_sfnt_off00005bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDA 19916 bytes
SHA-256: 8b19fd13ad5b08f11d9c4597e6f2a0c04d71b28f89248dcac2f5c29d09b121fb

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