Malicious PDF — malware analysis report

Static analysis result for SHA-256 839d6fd3d0790a94…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 14:13:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 206c0dd3d20cba155b793d44c76e1865 SHA-1: fce6c5441374fc65d761e3756b62f296772d75b4 SHA-256: 839d6fd3d0790a9476b9f4f76ab7c0321bf58bff0204b6c0d408c5376e3b93c5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDF files hosted on `jdlrelocation.com`. These links are designed to lure users with promises of game hacks and free currency, indicating a link farm or SEO poisoning attack. The primary lure URL is `https://netcdn.xyz/app/406889139/free-spins-coin-master-game-hack`. While no scripts were explicitly extracted, the structure and heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-spins-coin-master-game-hack PDF link annotation
    • http://jdlrelocation.com/images/_GM479516143.pdfIn PDF document text
    • http://jdlrelocation.com/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://jdlrelocation.com/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://jdlrelocation.com/images/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://jdlrelocation.com/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://jdlrelocation.com/images/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://jdlrelocation.com/images/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://jdlrelocation.com/images/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://jdlrelocation.com/images/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://jdlrelocation.com/images/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://jdlrelocation.com/images/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://jdlrelocation.com/images/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://jdlrelocation.com/images/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://jdlrelocation.com/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://jdlrelocation.com/images/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://jdlrelocation.com/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://jdlrelocation.com/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://jdlrelocation.com/images/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://jdlrelocation.com/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://jdlrelocation.com/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b5e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B5E 24600 bytes
SHA-256: 5c3c96c8b18b6db8367e8c1d4788ab41f4a5433aa76326571dce7620e2f893cf
font_01_sfnt_off000082d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D9 17884 bytes
SHA-256: 18816d8d761583b578c9833b8849e2eeaed27ef2f16a893d2032c58e3f8148b6

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