Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6ac7594f3d4869…

MALICIOUS

PDF

44.3 KB Created: 2021-05-15 06:23:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7d62d445634c7374775a21cdd8a64149 SHA-1: cc6d0057520754f6c8db851b2a8d423862a5f374 SHA-256: ef6ac7594f3d48696c74a24e238224ae2adc3091ab7b6e88b5e32ad39ee7f439
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and free currency, which is a common social engineering tactic. It contains links to known malicious redirectors, such as 'https://netcdn.xyz/app/431946152/rbx-hut-game-hack', designed to lead users to further malicious content or downloads. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/rbx-hut-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/make-free-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coinmaster-hack_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-fun-hack-online_GM406889139.pdfIn 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_003_off000047fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47FD 25016 bytes
SHA-256: e63e8ad163befe37994791fb90614a688a5fb8793c4b14c03b2f3cd8a8d54343
font_01_sfnt_off000081f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F3 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDE 17812 bytes
SHA-256: e24951961dffee7128ae3d90f7f1153dbc58b347b85dc2bf38d5c1c57fa85777

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