Malicious PDF — malware analysis report

Static analysis result for SHA-256 28188e4abcc0b1b0…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 22:06:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2d4cb7f716179ceff80da4a330b0c5c9 SHA-1: 9748296dfc3cea7474748581ec3a7b800ae11f8d SHA-256: 28188e4abcc0b1b0e115f3854c41fff912348dc1c30301412a533e9c598bcd29
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to a known malicious redirector, disguised as a 'free generator' or 'game hack'. The primary link directs users to `https://netcdn.online/app/406889139/free-spin-coin-master-link-2021-game-hack`, which is flagged as malicious infrastructure. The document body and heuristics indicate a social engineering lure to entice clicks, likely leading to further malware or phishing. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-spin-coin-master-link-2021-game-hack In PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-report-hacker_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-many-villages-are-in-coin-master_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
stream_004_off00004fb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB3 24416 bytes
SHA-256: f8819cb4f2a55524b83d9d2c8b4bb70fa3f36ae1e5085836f8ac70aeea445b8f
font_01_sfnt_off00008720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8720 18456 bytes
SHA-256: e9900cc34792e9e10189734f2c0a95be85fa7d2c8d6cb23872c5da80ce816735

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