Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dc20096de643e5…

MALICIOUS

PDF

45.5 KB Created: 2021-06-04 03:05:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 966b4f6caafea55392f21832e5393a64 SHA-1: 8fcd9782a0c7bd9010c5fffd13d19330b726e376 SHA-256: 88dc20096de643e5630435f7b52b6428204b4ace2fc48b22f06a451abb5c52e8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-free-spins-cash-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a social engineering attack designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/406889139/coin-master-free-spins-cash-game-hack In PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.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_off00004e1b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E1B 24708 bytes
SHA-256: 91550c25c6672c69e94dd523d1e0221e54a9448961f03c903b8aa3dc793c4448
font_01_sfnt_off00008603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8603 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00008fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB5 18052 bytes
SHA-256: 9bd717b0e04310867829ca511b483eebbd60050a5b8b31305794fbcb17f8519e

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