Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb4a1ca8c752a08…

MALICIOUS

PDF

30.4 KB Created: 2021-07-20 17:28:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 33c9b0854bb7ae11965489059e46563c SHA-1: e46b449bb30b0b20aa85dd6a12d6cf6d53085439 SHA-256: 6fb4a1ca8c752a08c058cd2b4afb56b9f86370a4ac6f80b62688be8fde00faa9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and scam-related content, such as 'free robux' and 'game hacks'. The document body explicitly mentions 'Free Robux Scams' and includes a call to action to access a 'ROBUX GENERATOR'. The embedded URLs are designed to lead users to potentially harmful websites, likely for phishing or scamming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://netcdn.tw/app/431946152/free-robux-scams-game-hack In PDF document text
    • http://stroygrad-spb.com/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://stroygrad-spb.com/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://stroygrad-spb.com/images/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • http://stroygrad-spb.com/images/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://stroygrad-spb.com/images/is-there-a-way-to-get-free-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
font_00_sfnt_off000025a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25A6 21072 bytes
SHA-256: 0024afdd1b6b130bf4c7fd3d116ed5163ae34c8c1f98712cf2e6165f2084cf69
font_01_sfnt_off00005386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5386 18688 bytes
SHA-256: b778a3c2a99961d14742e517d070f3eb9b56258bc2372469447924e166dcdd4d

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