Malicious PDF — malware analysis report

Static analysis result for SHA-256 a229bbd1ae266040…

MALICIOUS

PDF

28.8 KB Created: 2021-05-10 18:34:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5088bbc498ae974ff2d86fad85f50aa1 SHA-1: aef5afa7e8e612ae78d75389681f0d8f4b9d4f77 SHA-256: a229bbd1ae2660408ffe68509d5e55020e7d0265688b17328daf4539a9d31172
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux codes' and 'game hacks'. The primary link, https://netcdn.xyz/app/431946152/free-robux-codes-no-verification-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/free-robux-codes-no-verification-game-hack In PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/grab-points-login_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-robux-without-downloading-apps_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_off000022b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B2 19616 bytes
SHA-256: 912b5b6cd66cd5cd5c5350947f0951624a6f8f68fd156e2e377445a8b00e4da6
font_01_sfnt_off00004c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0D 18776 bytes
SHA-256: 1501cc25bcf8c3b3bf9df14f68216c1cc39cc5b0131e4343b63bafa21afb9c06

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