Malicious PDF — malware analysis report

Static analysis result for SHA-256 156fb5ea255288b9…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 15:09:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: de75e42aff86cd0a2c1446fa3e9af9b3 SHA-1: 2cb1f4f1370fb50af31325ac80369b9abc42961f SHA-256: 156fb5ea255288b9e4d0af975da7abb923c55e2d883d8fa8b43f4b23d7461a63
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to IP addresses, that are designed to trick users into downloading game-related hacks or generators. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to distribute further payloads or lead users to phishing sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-hack-2021-game-hack PDF link annotation
    • http://118.98.227.172/opac/repository/coin-master-deals_GM406889139.pdfPDF link annotation
    • http://118.98.227.172/opac/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-archer-in-plaza-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/contact-roblox-about-being-hacked_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-promo-code-hack-script_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-hack-into-the-big-brother-house-roblox_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/roblox-mad-city-cheat-to-kick-people_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/best-site-for-free-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://118.98.227.172/opac/repository/chrome-web-store-roblox-hack-jailbreak_GM431946152.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
font_00_sfnt_off00002f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4D 22412 bytes
SHA-256: 1722a169657ec3fb65a2e6ec6c00995e25c94d592de831034cfbef3e85e88737
font_01_sfnt_off00006134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6134 18408 bytes
SHA-256: 8438728008f6ab05b5c9a65d4eeb1f2e5c23a436eadc11c6e76328f72b7d7fb7

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