Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfe5407ef66638f…

MALICIOUS

PDF

46.2 KB Created: 2021-05-11 19:11:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f2311d339ef05116f35cade9f5273c54 SHA-1: 5630a6f1ada25603c8e029a096601eb9867eadfe SHA-256: ddfe5407ef66638fed49dec0c007577f0c6ea785c767b7e41609123aa7d50604
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and utilizes SEO link farming tactics to direct users to pages that promise free in-game currency or items. The ML classifier and heuristic firings indicate a high likelihood of malicious intent, likely to lead users to download further malware or engage in phishing. No scripts were extracted, but the presence of external links and the document's structure suggest a lure for potentially harmful downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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/431946152/what-games-on-roblox-give-you-free-robux-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/level-coin_GM406889139.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_off000049dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DD 25532 bytes
SHA-256: a634528b4cc2b4b86400bd2be1bed697ac98e2ec2ee8e0605b323d2021a8608e
font_01_sfnt_off0000850b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x850B 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBC 19440 bytes
SHA-256: d075b9cdfa29af0d09f3a3e5cc134cf400d7d34255e3ca0094b6ab529e7e4150

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