Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac2869107ef2175…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 13:25:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3d7cebd15d236faadcf43b8b8f753ed5 SHA-1: 09782ef3196948a9d911fce46f27c105aedd1a1f SHA-256: cac2869107ef2175773d13c71fdee9f0a45ec447865991ca65df14a1d948bd85
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 'game hacks' and 'free coins'. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-coins-cheat-game-hack. This indicates a social engineering lure designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score support this assessment.

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/406889139/coin-master-free-coins-cheat-game-hack In PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/roblox-how-to-hack-grand-blox-auto-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/free-robux-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/roblox-create-free-vip-servers-scripting_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/hack-pour-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/cool-looking-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/redeem-roblox-cards-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/pubg-uc-free-generator_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/free-roblox-code-giveaway_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pa-dompu.go.id//repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000034a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A1 22664 bytes
SHA-256: 093ced18ef33db1ef72a6530a2d5aa9379de6a693ce975a89e434a7c4f946440
font_01_sfnt_off000066f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F4 18164 bytes
SHA-256: 43b2cd904f38a7d3d2a55d0f85767f707de4b7de0854c719ea1a97ce2ab6716d

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