Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91cabf991c3320f…

MALICIOUS

PDF

33.1 KB Created: 2021-07-19 18:12:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bc309ea1d72d649e8c422bf66c13ab8b SHA-1: d7410871fb4c57cb7fb0f8c92e21309d50a020d2 SHA-256: a91cabf991c3320f064124929bcce25694d8dbcda2ed29a6545407e1eb876fbb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent call-to-action to download free Minecraft accounts. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a phishing or malware distribution attempt. While no scripts were directly extracted, the document's structure and content indicate it's designed to trick users into visiting a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/479516143/free-minecraft-accounts-reddit-game-hack In PDF document text
    • http://www.vista-design.hr/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://www.vista-design.hr/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.vista-design.hr/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://www.vista-design.hr/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://www.vista-design.hr/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.vista-design.hr/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://www.vista-design.hr/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.vista-design.hr/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.vista-design.hr/files/free-robux-roblox-promo-codes_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
stream_002_off00002e8a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E8A 22368 bytes
SHA-256: b9bbf93f154ab70af37079e3dffc30e06af12f4c3b8159b397e6c28bcef0a0bb
font_01_sfnt_off00006038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6038 18024 bytes
SHA-256: 8cc2f99dc924a15d52918b37ec4a77595277c9fc296e6ac0964170e61a15a16b

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