Malicious PDF — malware analysis report

Static analysis result for SHA-256 619bbe9504141384…

MALICIOUS

PDF

37.8 KB Created: 2021-05-24 07:24:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 53b836100afd5e3b48909d504f76cbc5 SHA-1: b70994cb82e35020ce86f612088ab4b0c9d2a002 SHA-256: 619bbe950414138468779f5227b9fa6481718cd18872cc760c23a9a3ae593f43
200 Risk Score

Malware Insights

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

The PDF document contains lures for "Free Robux Generator" and impersonates Facebook, directing users to a malicious URL. This indicates a credential phishing attempt, likely delivered as a spearphishing attachment. The embedded URLs and the document's content strongly suggest a social engineering attack aimed at tricking users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-generator-no-survey-no-download-no-human-verification-game-hack.
  • 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-robux-generator-no-survey-no-download-no-human-verification-game-hack In PDF document text
    • http://stpc.it/images/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/tiktok-free-hosting_GM835599320.pdfIn PDF document text
    • http://stpc.it/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/minecraft-fly-hack_GM479516143.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
font_00_sfnt_off00003443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3443 25484 bytes
SHA-256: f012afe047c0181450b847c5067e033cfe4b746b4d3fbe0c296d262c90a39e34
font_01_sfnt_off00006e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E07 19736 bytes
SHA-256: 3cea6d4f9da734904bcc55369e0b79f4621aa36195ab65246c463812034b9480