Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f239dbe7466f40f…

MALICIOUS

PDF

33.6 KB Created: 2021-07-07 10:04:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5be69be1c0c12429f00ae5d3da73d03b SHA-1: 4b9bfa97396d5f62ffb2784f9e77a5054c6936e3 SHA-256: 6f239dbe7466f40f4dede6a27a9b21152daf5ae2ae912d81b0db77841e1c05e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains and specific game-related PDF files, strongly suggesting a lure for users seeking game cheats or hacks. The primary redirector URL, http://netcdn.tw/app/479516143/free-minecraft-skin-maker-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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/479516143/free-minecraft-skin-maker-game-hack In PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/money-hack-roblox-retail-tycoon_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-hack-lumber-tycoon-2-script-inserter_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/static-moonactive-net-free-spins-coin-master_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_off000030ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CE 22124 bytes
SHA-256: a284f8c9d7f31b50ee024cae1c797c63da49827c391022c16d55226a47c6633d
font_01_sfnt_off000061a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A7 18024 bytes
SHA-256: ae8e9e7bdedeb0219c214c271fa7935e3d50c3d8e4c274774e7a90e4006841d3

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