Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ac02f7661c8410…

MALICIOUS

PDF

42.0 KB Created: 2021-05-17 08:31:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 312f0616bed10437e63b9285d83c3728 SHA-1: e4ecdfd24c98e022f50563499efec89364d29a79 SHA-256: b0ac02f7661c84105cf73fd64d36214cac4126445699d55e24aa0d9316b9321b
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and infrastructure, specifically targeting users interested in game hacks and currency generators. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs and a visual download button lure further support a malicious intent to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/ww-roblox-come-game-hack In PDF document text
    • http://unilin21.ru/images/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-100-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://unilin21.ru/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://unilin21.ru/images/wurst-112_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://unilin21.ru/images/roblox-robux-page_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_off00004759.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4759 25004 bytes
SHA-256: 15cd3edbf972226408488a886439cee65e3d6ef6387c06684d6b57cfc30b6e69
font_01_sfnt_off00008135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8135 18404 bytes
SHA-256: 888324a908a3e314fa586c71b84bf0ea365017427310ce851cb3785b25609904

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