Malicious PDF — malware analysis report

Static analysis result for SHA-256 add45f9f13081649…

MALICIOUS

PDF

35.6 KB Created: 2021-07-03 21:13:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c75366d392c5c13aefba544500836bd7 SHA-1: 688e14b80a685663be10d584dd9f5ef90cc2ea1b SHA-256: add45f9f13081649eb94fe409e0c9d956fda94ae92597cd13eacb26bf1e1108e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and generators, directing users to a malicious redirector at http://netcdn.tw/app/479516143/minecraft-free-download-ios-game-hack. It also contains a large number of links to other PDF files hosted on eyeonhimalaya.com, forming a link farm likely intended for SEO manipulation or further redirection. The ML classifier strongly indicated maliciousness, and the presence of multiple critical heuristic firings supports this assessment.

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.tw/app/479516143/minecraft-free-download-ios-game-hack In PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-robux-server_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/tiktok-fame-free_GM835599320.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/without-pokemon-go-free-evolution_GM1094591345.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/tiktok-free-online-games_GM835599320.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-promo-codes-roblox-2021_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-link-today_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_off000034a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A4 22780 bytes
SHA-256: ab95b545a48646fd6f7b3a24f4b3127af7d4db22caa5d1c24724ac3d396dd971
font_01_sfnt_off0000678a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x678A 18576 bytes
SHA-256: 5d1ddfef4721a7701aab153498b7a95b0a55dce7cfece3269a7933df316a78cb

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