Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67f44fca8b865d4…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 07:04:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c924ae2405abca7b1b5ce38746a25526 SHA-1: 5fd7aa1075f20c05f920629bae25a5a0f5e5707f SHA-256: f67f44fca8b865d4b5aa7aeeb8eebbf0952b652da546b1c138cfae61dee5940d
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm, directing users to sites offering game hacks and cheats. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a 'download button' heuristic further supports a malicious intent to trick users into downloading unwanted software. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/479516143/minecraft-wurst-client-game-hack
    • https://morishita-tc.com.tw/image/data/files/coin-master-hacks-for-cards_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-no-verification-required_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/robux-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-game_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/minecraft-java-hacks_GM479516143.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-mod-version-free-download-34-4_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-without-verification-2021_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-links-to-free-spins_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-15-free-spin-link-today_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-meme_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/can-i-get-robux-for-free_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/pokemon-go-free-item-bag_GM1094591345.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-cards-link-2021_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-25-spins-coin-master-links_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000519b.bin
b0a2f47b1e736d7c3e81a14025c0e78966c6adb396a6431aa401c692022129d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x519B 25032 bytes
font_01_sfnt_off00008a2e.bin
da8de394074f4ca1a4d818326f6763942cae13e643f91f1376333b749e0c27ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2E 17980 bytes

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