Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc9f09a41a96b32…

MALICIOUS

PDF

46.0 KB Created: 2021-06-09 01:50:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5a80a13ce4831c8f364f1ef12ceff052 SHA-1: d80aed576d5fbc1a419a730ed8d7d1082921c158 SHA-256: 0cc9f09a41a96b32292accb82a3d5cb70497db31ded514a35e3bcb11feecaf76
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF document contains a lure impersonating Facebook to trick users into clicking a link for free Robux. The embedded URL, https://netcdn.tw/app/431946152/robux-free-pastebin-game-hack, is suspicious and does not match the impersonated brand, indicating a likely credential phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and the ML classifier's high confidence suggest a malicious intent to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/robux-free-pastebin-game-hack.
  • 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.tw/app/431946152/robux-free-pastebin-game-hack PDF link annotation
    • http://perpustakaan.bkkbnkaltim.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-hub-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/robux-miner_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/good-roblox-games-about-cities-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/robux-earner_GM431946152.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://perpustakaan.bkkbnkaltim.id/repository/how-to-win-free-robux_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_004_off0000554c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x554C 25760 bytes
SHA-256: 8c25437adc5de73395f75a7dff9853608c8f159228159b27a375600e65aa2dfe
font_01_sfnt_off00009039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9039 18620 bytes
SHA-256: 3f1f2e26384a66204d6f7d075599a06500b3f0dd6fef368f6da1e950a9740516

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