Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9bb4f58177fa4f…

MALICIOUS

PDF

43.0 KB Created: 2021-05-12 10:05:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7c8331c0bbb3362e829e4e4eed5aa787 SHA-1: c00cc17ecd0051f14a0d896556e1a55ecfdb6951 SHA-256: bd9bb4f58177fa4f7ea0689e045d6e5a20262af3f079e3154f35e0980ee10369
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains a URL that appears to be a lure for game-related cheats. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the presence of numerous external links indicates a potential for redirecting users to malicious sites or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-get-free-shields-on-coin-master-game-hack PDF link annotation
    • http://perpus.masda.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/earn-rbx_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-gold_GM406889139.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_off00004b75.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B75 25480 bytes
SHA-256: d3ca0be185f9879eb527f1d39a20c19174677b7dd397cda24cc2a755e88ebb16
font_01_sfnt_off000085ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85EA 18288 bytes
SHA-256: 9f23db5f7e4aea9ade489dbfee04f76c59a98f319c99e466b9c1fecfdfb20686

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