Malicious PDF — malware analysis report

Static analysis result for SHA-256 3331cf08e33c4923…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 06:11:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bbe9bbaef43a5291153a69f14e98a8a4 SHA-1: a9ce67cce31906e0baa93c6b6b3bfe92497bdb64 SHA-256: 3331cf08e33c49235881c007d03354192a214a1091346ac9f565f04146860bf3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free generator / game hack" which redirects to malicious infrastructure. The embedded URL is a known malicious redirector, and the ML classifier also flagged the document as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other similar-looking PDF files hosted on the same domain, suggesting a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.online/app/431946152/free-robux-quiz-game-hack In PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/roblox-earn_GM431946152.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/tiktok-free-view-iphone-theme_GM835599320.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/coin-master-hacks_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_off00005230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5230 32920 bytes
SHA-256: 98ce199e18c316c20866639203c668c8637b0e3b247f7e1e9a12fe61106dcacd
font_01_sfnt_off00009980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9980 18376 bytes
SHA-256: b52519a3f27e6183245bec6d77d3cda93d913202ea7147b0d6d9048d316cd5fc

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