Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc873e86a1382f9c…

MALICIOUS

PDF

48.1 KB Created: 2021-05-11 23:42:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 34c19e28a83a92b7885f12d2a3b43811 SHA-1: 8537faf18fd65348979745b0e326a3973efa04c8 SHA-256: fc873e86a1382f9c3c024db56d98133052f8436651c2fb9b0074f8b613ca8826
82 Risk Score

Malware Insights

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

The document contains a lure for free Robux and includes an external URI pointing to a suspicious download URL. The presence of a 'Password-protected archive handoff' heuristic suggests the document may be part of a multi-stage attack designed to bypass security controls. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-robux-just-enter-username-game-hack PDF link annotation
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-games-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/2021-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • https://www.micIn 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
stream_003_off00004afa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AFA 33696 bytes
SHA-256: 706f12604b2ba16137a13a9015359d0249dc6281a4f0709a1c82ab6a8602f275
font_01_sfnt_off000097fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97FB 18960 bytes
SHA-256: ad194f5984d8cbd7c817d1b512f86f024f40bf30beebdf7d12c6ff62fc849400

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