Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dffd971a132e0a…

MALICIOUS

PDF

46.3 KB Created: 2021-05-12 10:00:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 20d0edeb0d071c2f81f2e40acbde97c9 SHA-1: 5113190a83694330f5a0fcaa6bcec9603cc39f5e SHA-256: 45dffd971a132e0a3a18998253419fc078ef5a55565652d432a632b665c562d9
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 currency. The ML classifier also flagged this PDF as malicious. The primary lure appears to be a 'free generator / game hack' for Coin Master, directing users to the URL https://netcdn.xyz/app/406889139/play-coin-master-for-free-game-hack. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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 https://netcdn.xyz/app/406889139/play-coin-master-for-free-game-hack In PDF document text
    • http://librarysenior.com//repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-g_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004826.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4826 28544 bytes
SHA-256: f86448c695c30f2d0c66612733798a1e1d17268ff79e85483e70084e3e5a6097
font_01_sfnt_off000088c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C7 3000 bytes
SHA-256: 56ee3cf210babcab1d595ec3cc7d666f7a646b8ea00ab1e6563ebd84f84582f8
font_02_sfnt_off00009326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9326 18116 bytes
SHA-256: 37b7c1d52da71900fe96da67641d66084da59d3226ff1799d5ac51fdc9d2defe

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