Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9cef26832a5470…

MALICIOUS

PDF

44.0 KB Created: 2021-05-12 01:06:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bc12f09beb8c62c2410a1393450d37f4 SHA-1: 2fa50c2263e3ff5cb9e638b6c0eae9f5423a110f SHA-256: 4d9cef26832a5470cba7cc0235a5dd8d3055b133ffee4c0a20c0579be6171418
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to known malicious redirector infrastructure, specifically advertising game hacks and free in-game currency. The primary lure URL is https://netcdn.xyz/app/406889139/gold-cards-coin-master-hack-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow, likely intended to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/406889139/gold-cards-coin-master-hack-game-hack In PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-daily_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/robux-com-free_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/10-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_003_off00004c64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C64 26864 bytes
SHA-256: 83b6df5d55aea7dd8c4db09627bbfa15d5fc2f00e22176566add1757a9223cc2
font_01_sfnt_off00008aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAD 17964 bytes
SHA-256: 5e7e042928fe04657102bb84442be0bc4eaf21c7bcdf31e92a05fff18f488254

Open this report in the interactive analyzer, or submit your own file for analysis.