Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a51ff324f2b0ba…

MALICIOUS

PDF

48.8 KB Created: 2021-06-11 12:28:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3502dff62b3519dc635498a9e119eb9b SHA-1: e0ebecf3db00f8d7e9023f11c6f0f0fe23a1d24b SHA-256: a4a51ff324f2b0ba1594e66f54b4e2f3efb860a900d59eae59824b44c7de6ab2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9796

Heuristics 5

  • 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.
  • 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.tw/app/431946152/murder-mystery-hacks-roblox-game-hack PDF link annotation
    • http://103.68.2.77/__statics/gudangsoal/files/demon-roblox_GM431946152.pdfPDF link annotation
    • http://103.68.2.77/__statics/gudangsoal/files/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/a-tool-to-get-free-in-roblox-purchases_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/descargar-hacks-para-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/free-working-roblox-cards_GM431946152.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://103.68.2.77/__statics/gudangsoal/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://collectrobux.coIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005411.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5411 26552 bytes
SHA-256: 048199ded74158301b3a842ced7b4981890ad383b9e598e83dfa2570ca06baa4
font_01_sfnt_off0000900a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x900A 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000099f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99F5 18976 bytes
SHA-256: 5aef1dbbdb040f0b37a38ae973bf83f3eeaf2b6556abdfeac8bb4cf75c04e941

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