Malicious PDF — malware analysis report

Static analysis result for SHA-256 931f26916fba4237…

MALICIOUS

PDF

34.5 KB Created: 2021-06-27 06:33:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 231bf8b0660957e7110019b56ecfde50 SHA-1: 3c6fb6bea41947f2233e7ee8a51e725425e7cd9e SHA-256: 931f26916fba4237e9420385b5c9f76e8c78bf8a1ec45678824d0461a744bdab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux hack generators'. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs likely lead to a second-stage download or phishing page, consistent with a spearphishing attachment attack vector.

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.co/app/431946152/free-robux-hack-generator-2021-game-hack In PDF document text
    • http://lib.fisipumt.ac.id//repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-sin-hacks_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/project-alpha-20-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-free-build_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/mad-city-cheat-roblox-kill-all_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-secret-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD0 22100 bytes
SHA-256: 985664e9d86ca780f3dd963079fc6ca3bac6b6d4602acb7ede38bf48e4ed82a9
font_01_sfnt_off000060a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A7 19392 bytes
SHA-256: a86a66aa215c4a6c1420a316fad1dc44acfead0b6237a5d506d2957225a2c08b

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