Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ccfccac544d2b2…

MALICIOUS

PDF

35.0 KB Created: 2021-06-29 14:33:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 51a645f7b435261ca039813b69f9cb34 SHA-1: c223394245c98176a430236447d8156d7b291ffa SHA-256: a4ccfccac544d2b2af1177e467fc40f369d98e807a51566657042d7b6b016242
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a document body that promotes free in-game currency and hacks for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'ML_NYX_PDF_MALICIOUS' suggests a high probability of malicious intent. The primary URL, http://netcdn.co/app/431946152/discord-free-robux-server-game-hack, likely serves as a download or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/discord-free-robux-server-game-hack PDF link annotation
    • http://akbidprimahusada.ac.id/elibrary/repository/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/how-to-get-roblox-membership-for-free_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/dbo-roblox-stats-hack_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/robux-today_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/how-to-cheat-in-roblox-hide-and-seek_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/freerubux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/logo-roblox-hack_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/roblox-body-free_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_002_off000030ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30EE 22344 bytes
SHA-256: eb3214bdb2da4ac3b3cedd71c39ba15a707099210a7dde21cf209069feddadcc
font_01_sfnt_off000062dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DC 19292 bytes
SHA-256: 93983d2323beb9a1591485557462a802c97ab01b7fed52c3762c4ff29911ddf7

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