Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc411bca66b6462…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 22:35:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8fc7b61dcce0cbefbc6b68a7142fa1ce SHA-1: 0ecd25f1f42ec69a50482d1de2d7de2c7946f48e SHA-256: 3bc411bca66b64629ebeb5fe1af86b086ef8e56e4ce01db14c65a13b6d597b02
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external resources, including a known malicious redirector at http://netcdn.tw/app/479516143/minecraft-hacks-18-9-game-hack. The document body and embedded URLs suggest a lure for game-related cheats and currency, which is a common social engineering tactic. The presence of multiple PDF-specific heuristics indicating malicious redirectors and lures reinforces the malicious intent.

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/minecraft-hacks-18-9-game-hack In PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/hack-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/hack-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/btools-roblox-hack_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/free-robux-message_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/earn-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/how-to-get-free-money-in-ultimate-driving-roblox_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/free-brown-pant-roblox_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/skin-for-roblox-boy-free_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/roblox-people-girl_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/roblox-egg-hunt-2021-hack-script_GM431946152.pdfIn PDF document text
    • http://inforplace.com.br/ckfinder/userfiles/files/free-links-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_off00003334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3334 22224 bytes
SHA-256: d90c5af4dd1b935122c1e9f27c5927e319a8a8ff71630e2c0bdabd2f811298b5
font_01_sfnt_off00006437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6437 18508 bytes
SHA-256: cd9237b9687b7c478886c0b60ca23dbd49803dce24975db22de6864494fbbe68

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