Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4f7d1e6b518a16…

MALICIOUS

PDF

50.0 KB Created: 2021-05-19 02:37:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fbfcbb6cc29774528377d2adb32dbd9a SHA-1: d518207afbbd14767db35f1282f202af04efb235 SHA-256: ca4f7d1e6b518a1681d66078da86a0fed4c5a8c03139b7d04967da14cb4c9cd3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous links to external websites, many of which appear to be related to game cheats and hacks. The presence of a "download" call-to-action, combined with the ML classifier flagging it as malicious, strongly suggests an attempt to trick users into downloading potentially unwanted or harmful software. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, further supporting a malicious intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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.xyz/app/431946152/oprewards-login-game-hack PDF link annotation
    • https://bioscience.kyst.com.tw/image/data/files/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/earn-rbx_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/rbx-website_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ba9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA9 24776 bytes
SHA-256: 868e63c8751e17e38b3a6741c378176a431e602242a4d30fa2436aeba9851c23
font_01_sfnt_off000084e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E3 8412 bytes
SHA-256: 4e92cec989804acf45ef19508aa11332e73097f9b7aed58c0b41254a134abffd
font_02_sfnt_off0000a07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA07C 18492 bytes
SHA-256: 81eae8079694c842f573892a7bdeb7507755234d7d643456fdd469df9fa7c23d

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