Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4acc9cb70ceca54…

MALICIOUS

PDF

33.4 KB Created: 2021-07-09 04:55:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 495eecc88aa6a9e2570f1d2e693b777a SHA-1: 2f0111629d40ccbe1a1dff067d0ddd2bf098d753 SHA-256: f4acc9cb70ceca542e2375802d3986ca5126624eae8014f1c3059965f64e1246
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, specifically targeting users with lures for game hacks and free currency. The heuristic firings indicate the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the document's structure and embedded links strongly suggest a social engineering attack.

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.tw/app/406889139/free-coins-and-spins-for-coin-master-game-hack In PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/hack-person-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/roblox-gun-game-hacks_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/robux-hack-very-easy_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/robux-hack-greasy-fork_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-free-likes-and-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-roblox-glasses_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_off00002d81.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D81 22476 bytes
SHA-256: 8008a92a32f0694e453ff22ae6425d8a39a5ad1f7a19cd638068dcdb9e725ae7
font_01_sfnt_off00005f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F94 18348 bytes
SHA-256: c90f632020bcb1e728f62a43997badda2860e0d329262e99dedc1f8a12c39115

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