Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9807f5581aa0dc5…

MALICIOUS

PDF

34.9 KB Created: 2021-05-20 21:11:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 351960f4ec07074723d3cc3d5fe297cc SHA-1: 8b12c26d37fe6b9c2cb7ccbe2968a6cabcae5cf6 SHA-256: a9807f5581aa0dc5e43e2156c34270aaf1af92ab69b0899e6c262a33320a10bd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised with lures like 'free Minecraft Skin Packs' and 'CLICK HERE TO ACCESS MINECRAFT GENERATOR'. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the overall structure strongly suggest a phishing or social engineering attack aimed at redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

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/479516143/free-minecraft-skin-packs-game-hack In PDF document text
    • http://linens.kiev.ua/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-robux-picture_GM431946152.pdfIn PDF document text
    • https://sigmaclient.info#2In PDF document text
    • https://flux.today#3In 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
stream_002_off00002f2b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F2B 24856 bytes
SHA-256: f05f9ec6670b5e55055a6dc8efd00dccddb3af637c8bb3508f06e60826ee60d3
font_01_sfnt_off00006875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6875 17892 bytes
SHA-256: 3d88f62d7f103248f07683485ae665a8ae7a7912bf87b287aa517b4ed8ad8cc7

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