Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1b83c6309e1734…

MALICIOUS

PDF

34.7 KB Created: 2021-06-27 21:43:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a803ada218c3d329403104dba26dc800 SHA-1: 75c6c75e3749b16b0edda58574b008a4e4127791 SHA-256: ba1b83c6309e17348151d73fc7e8df48210cf2539a634c728753c311326a64b1
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector infrastructure, specifically advertising 'game hacks' and 'free generators' for popular games. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly indicate a social engineering lure to trick users into downloading potentially malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/hero-online-roblox-any-quirk-hack-game-hack In PDF document text
    • https://www.gornjastubica.hr/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/robux-no-survey_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-pokemon-go-hack_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-can-you-upload-shirts-for-free_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coins-master_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 4

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
font_00_sfnt_off00003138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3138 22012 bytes
SHA-256: 1799e9d63f57c0218cc480f239bc895180e52032429e761bce717188e988f75e
font_01_sfnt_off000061f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F8 19256 bytes
SHA-256: 6d4e04a9796ca9a8311037ccf60c66e748eb8b85053bcb61867b6dc794ada130

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