Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf1b2137f5ca4f9…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 06:19:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: af406510a0b2897f7993d4961bc8a8cc SHA-1: fe7f400493ca6a796f505e42ae81be04e6343b08 SHA-256: 5cf1b2137f5ca4f974c7cdf759dcf02654a477c610da340a14f53f558ca8955d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free robux' to lure users. The primary malicious URL identified is https://netcdn.online/app/431946152/how-to-get-the-ninja-animation-in-roblox-for-free-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attack designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/how-to-get-the-ninja-animation-in-roblox-for-free-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/pubg-uc-ykleme_GM1330123889.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/original-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-minecraft-java-code_GM479516143.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
stream_004_off00005543.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5543 26196 bytes
SHA-256: 10c3ddfb9d36233417b3b92bda1e65af7fe451fcbfa75155c9ee370067f4e290
font_01_sfnt_off0000926b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x926B 19180 bytes
SHA-256: b2ff2b65613946511bab76a04fd5deadfce87360e159bbbe798e38168aee9be9

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