Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7ff4ac478b7478…

MALICIOUS

PDF

43.3 KB Created: 2021-05-14 17:32:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f6d0d3e18761220ae26b86494109f3e3 SHA-1: 1223cc21949f5948b4ae72150471e2658fcb020c SHA-256: de7ff4ac478b7478680c71dfb3d93a883d2912d67971db71f3507ddbfa1315de
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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-spin-hack-link-game-hack PDF link annotation
    • http://brandyourbody.com/images/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://brandyourbody.com/images/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://brandyourbody.com/images/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://brandyourbody.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://brandyourbody.com/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://brandyourbody.com/images/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://brandyourbody.com/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://brandyourbody.com/images/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://brandyourbody.com/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://brandyourbody.com/images/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://brandyourbody.com/images/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://brandyourbody.com/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://brandyourbody.com/images/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://brandyourbody.com/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://brandyourbody.com/images/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://brandyourbody.com/images/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://brandyourbody.com/images/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://brandyourbody.com/images/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://brandyourbody.com/images/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://brandyourbody.com/images/minecraft-wurst-hacked-client_GM479516143.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_003_off00004a72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A72 27884 bytes
SHA-256: 2c165eb5f112edb428971cbb5c117be95469ff3d9fc11227b867557a36dfa48d
font_01_sfnt_off00008821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8821 17892 bytes
SHA-256: 7f3ff29013eb9f1a81458cbc85dd3db40ecf793c6bb68bdfdc199744a029032c

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