Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42a076e99e45439…

MALICIOUS

PDF

40.4 KB Created: 2021-05-24 03:41:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 25226385201bad3852ce85ffa2738929 SHA-1: 561d48459f702e888e56bc314d192161ba5764db SHA-256: f42a076e99e45439fd04543a77953108f01a742d112a126ea313eb8065197391
122 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, including one that promises a "free robux generator hack". The presence of a fake CAPTCHA heuristic indicates the document is designed to trick the user into performing an action, likely to download or execute a payload. The ML classifier also flagged the PDF as malicious, supporting the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

Heuristics 5

  • 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.
  • 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
  • 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/431946152/free-robux-app-game-hack PDF link annotation
    • https://reggieslockandkey.com/images/tiktok-free-online-unblocked_GM835599320.pdfIn PDF document text
    • https://reggieslockandkey.com/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://reggieslockandkey.com/images/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://reggieslockandkey.com/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://reggieslockandkey.com/images/promo-codes-for-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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000034c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34C5 26752 bytes
SHA-256: 8b09ae1e2f1ea96870d396168f1bfb42db777d666289363efeabbf915f8fbb4c
font_01_sfnt_off000072c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C6 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB0 18192 bytes
SHA-256: b6ab7ec8c8ad827553cf0587115e299062cd48018093aec7e14a56fabc9ede42

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