Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcb1fffd4f6f270…

MALICIOUS

PDF

42.6 KB Created: 2021-05-10 14:14:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d00cc67a0b13b26657c45905e36c70d7 SHA-1: 0b8f3090965bf1d5a0323c684ad59c46bb3638c8 SHA-256: bbcb1fffd4f6f27070f9fb17b26c837eb203e2415f1e336bb15dbef4581d6d00
62 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, including one that directly links to a download for 'cute-free-roblox-outfits-game-hack'. The presence of a visual download button lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading potentially harmful content. The document's content and URLs suggest a lure for game-related cheats or hacks, which often serve as a delivery mechanism for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/cute-free-roblox-outfits-game-hack PDF link annotation
    • https://knj.com.tw/image/data/files/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/get-more-robux_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/wurst-112-2_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/mathep_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/moon-active_GM406889139.pdfIn PDF document text
    • https://knj.com.tw/image/data/files/easy-robux-today_GM431946152.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
stream_003_off000046e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46E2 26220 bytes
SHA-256: d0f9824a02e42912aebbe300ff0682f1e6deb9344f2a1dca47b0122801834ec1
font_01_sfnt_off000084a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84A2 18312 bytes
SHA-256: 2199fd6d62bdff63a90b18f1783fe44650e4aecd573f3309c05a38fa35b4e6eb

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