Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d81767f8a976c6…

MALICIOUS

PDF

50.2 KB Created: 2021-06-03 04:59:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: dd5176b899f9734a763f77f2b3dab8d5 SHA-1: e9c436586a0f998e72bef198268a83f5d062ab0b SHA-256: 49d81767f8a976c65d443a112e75b07628e15bf8a9b684e5dd8b6231b028188a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free in-game currency (Robux) and embeds multiple external links, including one to 'netcdn.online'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or SEO spamming tactic. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.online/app/431946152/how-to-get-free-robux-fast-game-hack
    • http://pustaka.fti.unand.ac.id//repository/free-minecraft-alt-generator_GM479516143.pdf
    • http://pustaka.fti.unand.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id/repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id/repository/coin-master-free-spin-links-december-30-2021_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id/repository/sites-to-get-free-robux_GM431946152.pdf
    • http://pustaka.fti.unand.ac.id/repository/not-a-scamhow-to-get-free-1k-robux_GM431946152.pdf
    • http://pustaka.fti.unand.ac.id/repository/coin-master-mod_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id//repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdf
    • http://pustaka.fti.unand.ac.id/repository/how-to-win-robux_GM431946152.pdf
    • http://pustaka.fti.unand.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id//repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id/repository/hack-coin-master-apk-download_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id/repository/how-to-get-free-clothes-on-roblox_GM431946152.pdf
    • http://pustaka.fti.unand.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id//repository/coin-master-free-spins-haktuts_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id//repository/free-robux-with-no-survey_GM431946152.pdf
    • http://pustaka.fti.unand.ac.id//repository/daily-free-spins-coin-master-2021_GM406889139.pdf
    • http://pustaka.fti.unand.ac.id//repository/roblox-free-item-codes_GM431946152.pdf
    • http://pustaka.fti.unand.ac.id/repository/how-can-i-get-free-coinsn-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055d5.bin
7e4949f92e70a9335ee35b69330c745ca2cfdaf6adcd48b31568141e2796d367		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55D5 32544 bytes
font_01_sfnt_off0000a173.bin
7aab2f7b5cdd23eaead05a2c9912e4a9dcd99cb50fd9423eae012b149ac71853		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA173 18512 bytes

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