Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acd315fceb5d940…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 06:18:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9fb7ce2a0ee0d41c0cf9b5c57b9a0eeb SHA-1: 0d3092ad61750dac21993b14e35bcdbff4d9333c SHA-256: 7acd315fceb5d940c684341bca922614b67fbe8cc5b253b8146b5df5bbe15699
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as free game generators or hacks. The embedded URLs suggest a phishing or scam attempt to lure users to malicious sites. No scripts were extracted, but the PDF structure and heuristics indicate a malicious redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/479516143/minecraft-images-free-game-hack In PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/games-for-robux_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/free-coins-for-coin-master_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_004_off000053c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53C7 25364 bytes
SHA-256: 72d408d48d03b4eead93b02f83dd63616d2512bb72ac7717dc4a0645ab6fd749
font_01_sfnt_off00008cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF9 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00009699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9699 18116 bytes
SHA-256: 76604dd5740139514d3fd46c2a9d9c838f52c59b348f00b4ee9f07d20b77a693

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