Malicious PDF — malware analysis report

Static analysis result for SHA-256 a842fa38491b49c7…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 11:11:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a353784b71f300a6d0aeddb71ec93f34 SHA-1: 2e3d1cddc8afb7e589eafbc813bf8b3d8e567ecf SHA-256: a842fa38491b49c76138d17a2a3c70e4f7cc1f371812a23b8005661d020097fa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and further PDFs, masquerading as generators for popular games. The ML classifier also flagged this PDF as malicious. The primary lure appears to be a 'free generator / game hack' which leads to a chain of redirects and potentially malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-daily-spins-coin-master-game-hack In PDF document text
    • http://petrorang.com/admin-panel/products/images/files/free-roblox-cards-2021_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/coin-master-hack-apk-35-33_GM406889139.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/free-robux-master_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/play-free-games-online-without-downloading-roblox_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/free-avatar-animation-roblox_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/how-to-hack-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://petrorang.com/admin-panel/products/images/files/hack-coin-master-ios-download_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
font_00_sfnt_off000031ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EA 23092 bytes
SHA-256: 3654c64d7a8e30652f828647743a286a418603fc5d3b959be81b23eae4f636ca
font_01_sfnt_off000065ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EC 18596 bytes
SHA-256: 4ad8fd882529be3d23a027a1092be38fd3a881cb86878c09c64331b24aa9a906

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