Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b555f76cd958b3e…

MALICIOUS

PDF

44.9 KB Created: 2021-06-04 01:32:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 66ee953145cc36225c3607789814a7e6 SHA-1: d3db8cf86758bcf499b9625913a501db1e762bdf SHA-256: 1b555f76cd958b3ea5f9da27a334848de67414c1f77dfdd071aec15da8622057
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for free in-game currency for popular games, directing users to external URLs. The presence of embedded URIs and a high ML classifier score indicate malicious intent, likely to facilitate phishing or malware distribution. The document body itself is heavily obfuscated, but the embedded links and heuristic firings strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/406889139/how-to-get-free-spins-and-coins-on-coin-master-game-hack PDF link annotation
    • http://183.91.70.11/repository/robux-com-free_GM431946152.pdfPDF link annotation
    • http://183.91.70.11/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/wurst-download_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://183.91.70.11/repository/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://183.91.70.11/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000528a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x528A 25408 bytes
SHA-256: c99c386ac32adef8b710b09a2c3996f8ca2d655a96dbcc6a61ef55a0ec406790
font_01_sfnt_off00008d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D42 18224 bytes
SHA-256: c3eeb8e5bbecb0a66d0dccf890560b2772aaf25cfcf2943a976e8e45774626aa

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