Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e4f3a7e20f3c77…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 13:53:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5cd118837d9a4aa0a8351a7b75049e2d SHA-1: be327f9bd75e794ad8ab285150154ba4e7d2301d SHA-256: 23e4f3a7e20f3c77be0ed4c541fbd9116a489a33f0c530294bfe80570860d73e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary redirector URL is http://netcdn.tw/app/431946152/is-roblox-studio-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further malware delivery or credential harvesting.

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/is-roblox-studio-free-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/robuxian-hat-ives-off-1m-robux-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/be-a-parkour-ninja-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-roblox-dances_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/pokemon-go-free-codes-2021_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-hack-dead-winter-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/dungeon-quest-free-account-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/roblox-girl_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/bloxland-earn-free-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_off00002fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCF 22468 bytes
SHA-256: 7aab7a986ae82d760148a066e33997a0b96ad2c418ebea8b13210e43fd6a1370
font_01_sfnt_off000061f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F7 19188 bytes
SHA-256: 5b1de23626d81aaf99a279195b00efdf905ea81811442041bbbefcdac3d0aa36

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