Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa80021edddd1e1…

MALICIOUS

PDF

46.5 KB Created: 2021-05-11 00:30:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 74a2e2e26744c637a24e1d44c7a183c0 SHA-1: 6b4f2ab0ff2db24858a232818fad43ace65baa12 SHA-256: 6aa80021edddd1e11779b7ace6d887efc7d1c2d9058a88041c039cbee0422484
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDF files hosted on external domains. This suggests a link farm or SEO spam operation. The presence of a "download button" heuristic and the ML classifier's high confidence score further indicate malicious intent, likely to drive traffic to these spam sites or potentially distribute further malware. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/406889139/coin-master-free-spin-and-coin-links-game-hack
    • http://perpustakaan.iahntp.ac.id/repository/get-roebucks-com_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-gold-cards_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-2021-spin-link-today_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/optifine-mcpe_GM479516143.pdf
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hack-no-verify_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/free-game-packs-for-coin-master_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-outfits-on-roblox_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-bedrock-download-pc-free_GM479516143.pdf
    • http://perpustakaan.iahntp.ac.id/repository/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/free-spins-coin-master-no-survey_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/legitimate-coin-master-free-spins-apk_GM406889139.pdf
    • http://perpustakaan.iahntp.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdf
    • http://perpustakaan.iahntp.ac.id/repository/worst-client_GM479516143.pdf
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdf
    • http://perpustakaan.iahntp.ac.id/repository/play-minecraft-online-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bc7.bin
2c4517994be8b4896693b2532bc6ac4aca9413e1ef4189c739d93f8216a4b42d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BC7 25440 bytes
font_01_sfnt_off000085cf.bin
dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85CF 4020 bytes
font_02_sfnt_off00009356.bin
ab1c4cdc214a6baf81a15e2f62a40ea9cfbbbf407f0f3dd1c7564e467cf0dae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9356 18228 bytes

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