Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ee9a55100adb10…

MALICIOUS

PDF

35.0 KB Created: 2021-06-30 17:39:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bb01b96d5c3c05028d0b6e2710feb508 SHA-1: 5f7657e97f1e476a7403c4abec19b2d49cbf4de9 SHA-256: b8ee9a55100adb108127e6ee024b59bd7a5cf4389db656c94a86425f75440f98
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically advertising free game hacks and currency generators. The ML classifier strongly indicated maliciousness, and the document body, though partially garbled, contains references to these lures and URLs. The primary attack vector appears to be social engineering via a malicious attachment, leading users to potentially harmful external sites.

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.co/app/431946152/free-robux-gamer-game-hack In PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-hack-roblox-bubble-gum-simulator_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/robux-builders-club-hack_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-robux-for-free-without-cheating-or-hacking_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-hack-roblox-and-get-free-stuff_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/fast-hacks-robux_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-free-gamepass-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-anything-in-the-roblox-catalog-for-free_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/mr-pretty-good-job-so-far-roblox-hack_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-youtube-pastebin_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_off00003122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3122 22720 bytes
SHA-256: f54a883daaf2fc4e6e28637c787595a4e8753e1407823a08fabe1179e3188895
font_01_sfnt_off000063ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63ED 18976 bytes
SHA-256: 4b09f12c04df7c93ff0c0122ae3de16621dc5f7cd0f94916dde1e5687602edc8

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