Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b9d53d670ccafe…

MALICIOUS

PDF

44.0 KB Created: 2021-05-15 16:36:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: adc6d4cf40b469ac36bf9d7e72e4678b SHA-1: 7ebcb9f902ec33f4d7bca7b44301d7851f323ddb SHA-256: a5b9d53d670ccafee8b756ee894d921b15813bb32992913785797ee1205b39fe
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to sites offering free in-game currency or items for popular games like Coin Master and Roblox. The document body and heuristics indicate a lure for users to click these links, which likely lead to phishing or scam websites. The presence of embedded URLs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-generator-without-human-verification-game-hack
    • http://oceanos.pl/images/10-free-spins-coin-master_GM406889139.pdf
    • http://oceanos.pl/images/how-to-get-minecraft-java-free_GM479516143.pdf
    • http://oceanos.pl/images/get-free-robux-no-human-verification_GM431946152.pdf
    • http://oceanos.pl/images/websites-that-give-you-free-robux_GM431946152.pdf
    • http://oceanos.pl/images/blogger-coin-master-free-spins_GM406889139.pdf
    • http://oceanos.pl/images/roblox-generator_GM431946152.pdf
    • http://oceanos.pl/images/free-coin-spin-daily-link-coin-master_GM406889139.pdf
    • http://oceanos.pl/images/best-site-for-free-coin-master_GM406889139.pdf
    • http://oceanos.pl/images/real-robux-generator_GM431946152.pdf
    • http://oceanos.pl/images/can-i-get-robux-for-free_GM431946152.pdf
    • http://oceanos.pl/images/coin-master-hack-tool-no-survey_GM406889139.pdf
    • http://oceanos.pl/images/coin-master-hack-tool-download_GM406889139.pdf
    • http://oceanos.pl/images/coin-master-hack-version-download_GM406889139.pdf
    • http://oceanos.pl/images/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://oceanos.pl/images/coin-master-pro-hack_GM406889139.pdf
    • http://oceanos.pl/images/free-girl-hair-roblox_GM431946152.pdf
    • http://oceanos.pl/images/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • http://oceanos.pl/images/free-gifts-coin-master_GM406889139.pdf
    • http://oceanos.pl/images/free-roblox-accounts-that-work_GM431946152.pdf
    • http://oceanos.pl/images/kachifpro_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b2b.bin
d5b99094148757baa3a50362bb15aac8e0bd18a453a9050dcbb916923c3da09d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B2B 30008 bytes
font_01_sfnt_off00008847.bin
560f5148e24a3ab67e773876ce527874ae2d943094ab10326a5f2249ef84e33a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8847 18784 bytes