Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5ea3baeebdcdf2…

MALICIOUS

PDF

42.2 KB Created: 2021-05-19 11:53:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 891a7426feebf28b63580aef9e919629 SHA-1: a609584b54faaa4f1b63e4e583b944949a4af090 SHA-256: ca5ea3baeebdcdf29141538af4f3f66928bf16fee14cdf82da0717bd92f42782
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or content aggregation strategy. The document body and heuristics indicate a lure related to 'Coin Master' and free spins, likely a pretext to drive traffic to malicious or phishing sites. The presence of a PDF_SEO_LINK_FARM heuristic firing strongly supports this attack pattern.

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/coin-master-daily-free-spins-link-facebook-game-hack
    • http://oceanos.pl/images/coin-master-hack-pro-gamers-com_GM406889139.pdf
    • http://oceanos.pl/images/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://oceanos.pl/images/hack-coin-master-no-verification_GM406889139.pdf
    • http://oceanos.pl/images/coin-master-spin-link-today-2021_GM406889139.pdf
    • http://oceanos.pl/images/free-robux-no-verification-2021-android_GM431946152.pdf
    • http://oceanos.pl/images/app-master_GM406889139.pdf
    • http://oceanos.pl/images/coin-mster-free_GM406889139.pdf
    • http://oceanos.pl/images/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdf
    • http://oceanos.pl/images/free-roblox-characters_GM431946152.pdf
    • http://oceanos.pl/images/how-to-downgrade-minecraft-pe_GM479516143.pdf
    • http://oceanos.pl/images/roblox-generator_GM431946152.pdf
    • http://oceanos.pl/images/roblox-skins-boy-free_GM431946152.pdf
    • http://oceanos.pl/images/coin-master-daily-free-coins-link_GM406889139.pdf
    • http://oceanos.pl/images/show-me-how-to-get-free-robux_GM431946152.pdf
    • http://oceanos.pl/images/coin-master-free-spin-app-iphone_GM406889139.pdf
    • http://oceanos.pl/images/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • http://oceanos.pl/images/coin-master-free-spins-2021-hack_GM406889139.pdf
    • http://oceanos.pl/images/free-robux-without-verification-or-survey_GM431946152.pdf
    • http://oceanos.pl/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://oceanos.pl/images/robuxmatchcom-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b1a.bin
c29bddd85cc543e9e12040dda80b5b7321517371dfa519322a71a3424ae013da
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B1A 23828 bytes
font_01_sfnt_off00008155.bin
50d107b0548bd3d005e8b5e4f9cf847a43b3082c8a2089b5591d39299d79db66
pdf-font-stream PDF embedded font (sfnt) at offset 0x8155 18636 bytes