Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bacbe85f78cf2c…

MALICIOUS

PDF

43.0 KB Created: 2021-05-12 18:04:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9cd1271a401fb72c448b055ceaf8c294 SHA-1: 728ae66edde9d373dc310e4d9c8596d085890463 SHA-256: 45bacbe85f78cf2cd9a5051258d631fd06b525e1228ff0ec83c72daaf4f5cb58
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm designed to drive traffic. The document body and extracted URLs indicate a lure related to obtaining free in-game currency or cheats for popular games like Robux and Coin Master. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

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/431946152/how-to-get-free-robux-for-kids-game-hack
    • http://digilib.akbid-alsuaibah.ac.id/repository/minecraft-114-4-download_GM479516143.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-heaven-free-spins_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/how-to-really-hack-coin-master_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-private-minecraft-server_GM479516143.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-free-spins-without-verification_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/moonactive-coin-master_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-free-spins-activegamer_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-hacks-no-human-verification_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/minecraft-com-free_GM479516143.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-free-spins-and-coins-group_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-free-spins-today-39_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-free-attack_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/coin-master-haktuts_GM406889139.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdf
    • http://digilib.akbid-alsuaibah.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdf
    • https://rblx.land
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a5d.bin
f0878e2e7bf1cb2388159cfcff3e20f28153c0b5f7a34c42b0c38d87b632e150		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A5D 26296 bytes
font_01_sfnt_off000084d0.bin
d8259766cf036cd113d0b26237eaaf1c704bfb1290fa2ba3336ef80e6ae93167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D0 18576 bytes

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