Malicious PDF — malware analysis report

Static analysis result for SHA-256 5533c32eeceef921…

MALICIOUS

PDF

49.5 KB Created: 2021-06-04 04:25:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 749aa379232f5686ac65c1b0fd64e3f7 SHA-1: 6c7a2723b6e2ef848e2205f33647e893a7037a5e SHA-256: 5533c32eeceef921ad51811ba64d33b4b1de46ed29cbc6fa7f819bd0c6407fca
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 'free Robux' or game hacks. The primary malicious URL identified is https://netcdn.online/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 suggest a phishing or redirection attack aimed at tricking users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-robux-no-human-verification-or-survey-2021-game-hack In PDF document text
    • http://library.umla.ac.id//repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-daily-link-updated_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_004_off0000515e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x515E 27228 bytes
SHA-256: 6bc5018495ac0897ca213dca042b1a100dc4003b2106462dcee6655b48651681
font_01_sfnt_off00009051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9051 3028 bytes
SHA-256: f2659a98391bd2957da27da9f9b0f6e8b72555a3536d18ae9b0841453e1945ec
font_02_sfnt_off00009abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABC 19556 bytes
SHA-256: 08b2a18d96b3566ec838f0e87c4bb916e955b8f8af04b9064418114d078945b8

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