Malicious PDF — malware analysis report

Static analysis result for SHA-256 878babb999f3bc81…

MALICIOUS

PDF

46.3 KB Created: 2021-05-11 03:19:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4dee255609d4257611f802520bf5ee65 SHA-1: dba48dde6243116454f8c077baea092365e1dea8 SHA-256: 878babb999f3bc818fe4d679ad748dfe8e14fe17543e1ad92473b58c17a572db
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains external URIs and embedded URLs that advertise free games and hacks, suggesting a lure for users to download potentially malicious content. The presence of a callback lure heuristic indicates a potential phishing or tech-support scam attempt. While no scripts were explicitly extracted, the ML classifier and heuristic firings strongly suggest malicious intent, likely related to distributing malware or conducting phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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/479516143/free-games-like-minecraft-game-hack PDF link annotation
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/robux-rewards_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-tips_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/how-to-get-free-robux-without-human-verification_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_off00004ed4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED4 26792 bytes
SHA-256: da51b3988bffaba160f25de3b21003b2b508b0312d5929ab058cd896b14c40dd
font_01_sfnt_off000089f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F5 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000093a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93A7 17996 bytes
SHA-256: 6316af01e653c53aa8313e9ee065e63d320a9dd1c98e4ac08eccbec55cd1c79a

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