Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f64a41ad346a81…

MALICIOUS

PDF

47.8 KB Created: 2021-06-03 22:00:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9ef70da5bf78a689977742ec95cfede2 SHA-1: 2ef441ec8a1d96fc56116acfdcd5deb70c15615f SHA-256: 03f64a41ad346a8164670a55286f9f79cd96c8da0ac2d2e9f385dacd895f030f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to a known malicious redirector, masquerading as a lure for free Robux and game hacks. The document body, though heavily obfuscated, contains references to these lures and the malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/free-robux-games-that-actually-work-game-hack In PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/pokemon-go-free-pokemon_GM1094591345.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/rblx-city-free-robux_GM431946152.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
stream_004_off000055b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55B8 28220 bytes
SHA-256: 183c4b7faf84383e42ea67e01b608dc26530c8eb91385fdd310eb6fcf88fa652
font_01_sfnt_off00009539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9539 19392 bytes
SHA-256: 2bd118a57b53ff37cab680797aee460eb59fed046ceba4ed0277135d7eae5baa

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