Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b2ae057f4ecede…

MALICIOUS

PDF

33.8 KB Created: 2021-06-30 00:32:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 19f206c71d5577831b63f01e66e4832c SHA-1: c88f81bcea33d531e1bf847aa05c6dc6858aae22 SHA-256: c9b2ae057f4ecedee14c11702be57fcafb7bc32493cb03f304f42a4f9762cd91
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing deceptive content related to game hacks and free currency to entice users. It contains numerous links, including a primary malicious redirector at http://netcdn.co/app/431946152/roblox-countdown-games-hack-game-hack, which likely serves as a gateway to further malicious content or downloads. The document body and heuristics indicate a strong SEO link farm strategy, directing users to a large number of other PDF files hosted on cleansui-home.com.tw, likely for traffic generation or further distribution of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/roblox-countdown-games-hack-game-hack In PDF document text
    • https://cleansui-home.com.tw/image/data/files/new-how-to-get-1m-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/wurst-client-download_GM479516143.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/prison-life-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/new-this-number-glich-gets-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/roblox-studio-free-draw_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/weird-roblox_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-robux-promo-codes-november-2021_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/roblox-fun-com-robux_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_off00002f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6F 21100 bytes
SHA-256: 0b53d721630e110fafeb55f1c531fde36e70acc5dc16483ccab0f068dfacb327
font_01_sfnt_off00005d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D64 19496 bytes
SHA-256: 62247b9a4f839105717facf7688fb98e9c0725124b16624e21ccb0c7d88bf775

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