Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff92119887de622…

MALICIOUS

PDF

33.9 KB Created: 2021-07-07 06:09:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9d3b1a1d304094354f8aaa0899b873c7 SHA-1: 674d8788e5a7b480fe7b5d9aa725701edc1bb3aa SHA-256: 5ff92119887de6221a5cd52c617df25121e837325ef91962a91066c727246b64
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and embedded text that promote 'free generators' and 'game hacks', specifically for Robux and Coin Master. The primary link, http://netcdn.tw/app/431946152/earn-free-robux-today-game-hack, is identified as a malicious redirector. This indicates a social engineering lure designed to trick users into visiting a potentially harmful site, likely for credential harvesting or malware delivery.

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/431946152/earn-free-robux-today-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/pokemon-go-free-key_GM1094591345.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hack-aimbot-roblox-gartis_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-codes-tool_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_off00002f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F88 21816 bytes
SHA-256: bc9f30f6a34dfedd39b8c194d84126e73a5bfde741bec13db2c9674cfa6a9c90
font_01_sfnt_off00005f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5D 19072 bytes
SHA-256: 82db6ce193e18a75fae7aab420d9e740a3b7c910ba2cb20ee9d5d98feb1db9a0

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