Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b3ea40e3a8f5a2…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 17:26:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5f88e57bac71713ffa63d66e6ef30207 SHA-1: 235f7301f41190ac58592caa48f1953eba30482b SHA-256: b6b3ea40e3a8f5a21d9d7ab8facc37ce2f0f8b65320b30c117e9961ce3641aae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising game hacks and free currency for games like Coin Master. The ML classifier and heuristic firings strongly indicate malicious intent, likely to lead users to phishing or malware download sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a lure for initial access, likely via spearphishing.

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/hackear-coin-master-espaol-game-hack In PDF document text
    • http://librarysenior.com//repository/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coins-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/hacked-server-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/5-games-that-give-out-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/is-roblox-on-switch-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/lazyblox-com-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_off000030ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CA 22732 bytes
SHA-256: 672d40afe4acddc3274622c1810822b70d93aa2af253082ffd993baa2fd1b8d5
font_01_sfnt_off000063d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D1 18252 bytes
SHA-256: a1701d1fb432a44730dafaad2dc373a01df2a8671beb9c3eca5caf088f1719fa

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