Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6ccdfd93a49cd3…

MALICIOUS

PDF

44.2 KB Created: 2021-05-12 19:31:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c0473024df0f2751a8ebb7f4399b4238 SHA-1: 5cbba7c3f0e45277dfe9a260a41fd07aeefcd893 SHA-256: 4f6ccdfd93a49cd35f795af532881314b65d44a2fb2259000cde1635b617fbf5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or 'game hacks' to lure victims. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-no-human-verification-or-survey-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a social engineering attack aimed at redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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/431946152/free-robux-no-human-verification-or-survey-2021-game-hack In PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-coin_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/watch-ads-for-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_off00004ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA4 25296 bytes
SHA-256: 96a1763c85756b8f88f4938a94fc32659b7b8eb806fcc80450365847b74aee2b
font_01_sfnt_off00008681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8681 19556 bytes
SHA-256: 08b2a18d96b3566ec838f0e87c4bb916e955b8f8af04b9064418114d078945b8

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