Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d07082c90e30dc…

MALICIOUS

PDF

48.2 KB Created: 2021-06-04 02:19:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5778b804bb7820dccb5bbe56874d7261 SHA-1: 80083d81dd8214f33a78e4d6c6888d0e9da2439e SHA-256: e9d07082c90e30dcfc77969077ca6e9edae3e8af021edfb3d7b067cbfe445a4e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'game hack' which redirects to a malicious URL. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be generated by wkhtmltopdf. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to lead the user to a phishing or malware distribution site.

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/406889139/coin-master-heaven-game-hack In PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/panel-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/minecraft-handbook_GM479516143.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_off000050df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DF 31116 bytes
SHA-256: 957c664aebdc9c70789d87e086941d453ca1b635237eef14f517d464dbd75787
font_01_sfnt_off00009184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9184 2920 bytes
SHA-256: 64c53edae7920bc04119553d13e7f88c7ab8c9d6abd0f5e62be35afdb33f76ff
font_02_sfnt_off00009ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA0 17660 bytes
SHA-256: fef13a17f0333e264b660aea2ea076d90d1007d0c35aaf86fed193eccf6e0756

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