Malicious PDF — malware analysis report

Static analysis result for SHA-256 143c835750bbfadc…

MALICIOUS

PDF

33.7 KB Created: 2021-07-09 09:52:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 15be4acf247b6c6f018a486b103cc381 SHA-1: 3edea6618290edc98960ad5d631930001302f573 SHA-256: 143c835750bbfadc4c98c576101b04558ffa141dcf7b8bc22c8e9ac45644d423
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDF files related to game hacks and cheats. The primary URL, http://netcdn.tw/app/479516143/minecraft-client-game-hack, directly suggests a download lure for game modification tools. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports a malicious intent to distribute potentially harmful software.

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.tw/app/479516143/minecraft-client-game-hack PDF link annotation
    • https://healthcare.kyst.com.tw/image/data/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/hack-speed-vehicle-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-hack-username_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-roblox-girl-outfit-codes_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-hair-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-free-robux-generator-bc-only_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/best-free-roblox-plane-game_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-gamepass-script-roblox-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-play-online-free-no-download_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-spin-coin-master-app-download_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_off000030ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30ED 22272 bytes
SHA-256: 2d1e9107d40e7ae4d11b59988edb900f3fc56fcc8199d5c05a1a69a398f93a59
font_01_sfnt_off0000622c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622C 17928 bytes
SHA-256: 57e76fad508f079f9043ac60b045ca945e272a559816a83973d2a5b91d0e9761

Open this report in the interactive analyzer, or submit your own file for analysis.