Malicious PDF — malware analysis report

Static analysis result for SHA-256 86924fef787f7e2f…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 09:28:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2db3ba51c041b698399df902f2a17d31 SHA-1: 1a357cea92e8bffdd717e07e6519697626600547 SHA-256: 86924fef787f7e2fe32a59b15e7cbe202ee510443709e15d8941ce6e232968f7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically advertising 'free generators' or 'game hacks'. The primary redirector URL identified is http://netcdn.tw/app/431946152/instantrobux-game-hack. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence score indicate a clear intent to lure users to potentially harmful content. The document's structure and content suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/instantrobux-game-hack In PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-get-free-group-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/free-robux-copy-and-paste-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan62.smkn62-jkt.sch.id/repository/coin-master-2021_GM406889139.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_off0000316e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316E 22508 bytes
SHA-256: 3e1a133f8c7cc68ba4d58b59c726afbd210535e7e3e1028b85f9eae6c9ac405c
font_01_sfnt_off000063d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D8 18656 bytes
SHA-256: 5a13a4ba7d4aa3ba564163d7fd1f4e40de414e0c8b16d10ac9018e4301010f0d

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