Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da3d4c61cdaf947…

MALICIOUS

PDF

43.8 KB Created: 2021-05-13 22:20:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a5103c15e09b817f6864fa693163eb72 SHA-1: 723038aa5868681db9b287a085d03d79edabb702 SHA-256: 7da3d4c61cdaf947cc0650968fab25bd3264249bff5c549f0909840d0ac01123
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to redirectors and SEO spam pages, disguised with a fake CAPTCHA lure to trick users into clicking. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-roblox-accounts-game-hack. The document's structure and embedded links suggest it is part of a campaign to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/free-roblox-accounts-game-hack In PDF document text
    • http://linde-erbach.de/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://linde-erbach.de/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://linde-erbach.de/images/free-roblox-website_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_off00004a81.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A81 27348 bytes
SHA-256: a68e02abbdc7c8988323c355e5ba211efd95e33950c848a4560dde5ae391f5ba
font_01_sfnt_off00008904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8904 18192 bytes
SHA-256: 9af8fc399b7603ded65a47756b8d28ab9f279dafa7c0fe2cd6f7ecbc085cbebe

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