Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21579caef8fb25d…

MALICIOUS

PDF

52.1 KB Created: 2021-06-03 04:56:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 85c6a61e321ab8ed070c520792b3f1f9 SHA-1: 9fd93b92b2dcda06619d5e1ea5aa748d8e8e9415 SHA-256: e21579caef8fb25d7cfba4f1ac03f4294aaf7bac12412641a674f1ef79b5804c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free currency'. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click these links, likely to download further malware or engage in scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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/game-give-free-robux-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005236.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5236 26496 bytes
SHA-256: 6e934728abc927d714aedbc9f0368b75e45e69c4d76415eb3c38c6e3062cf533
font_01_sfnt_off00008da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA2 2844 bytes
SHA-256: d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43
font_02_sfnt_off0000975d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x975D 6700 bytes
SHA-256: ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27
font_03_sfnt_off0000a79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA79A 18736 bytes
SHA-256: 457049c0c0b067ea8a2ccaf5c24f39a354f8c872058b648fa686429afe9091ea

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