Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff2b9df1aeb623b…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 08:32:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7151e178a761c61754ec3e6fc610e35d SHA-1: ac920ee6662ca1b00df80d3f8c5b3912a53bee36 SHA-256: 8ff2b9df1aeb623b1239492d838d097a5d208c1535cffc70fa052ab4f460897d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'generators' for popular games. The primary lure is the URL http://netcdn.tw/app/431946152/roblox-hack-game-game-hack, which is flagged as malicious. The document's structure and embedded links suggest it is designed to trick users into visiting these malicious sites, likely leading to further malware downloads or phishing attempts. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate a 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/431946152/roblox-hack-game-game-hack In PDF document text
    • https://domc.tw/upload/files/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://domc.tw/upload/files/free-code-robux-2021_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/download-roblox-windows-7-free_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-get-a-free-membership-on-roblox-useing-hacks_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-dominus-roblox-not-a-model_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/when-pubg-uc-available_GM1330123889.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-get-free-robux-no-survey-no-offers_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/how-to-hack-roblox-with-charles_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://domc.tw/upload/files/free-credit-card-numbers-roblox_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_off00002f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4D 22704 bytes
SHA-256: ce19bd79724d912d9f15d12f43899b6d6266965e31eed928a0dfa1c12977c862
font_01_sfnt_off0000622b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622B 18916 bytes
SHA-256: d5b7e8b59fa9782264f7ee2edc2597070f93b03102e5dae9fe86d552d037f777

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