Malicious PDF — malware analysis report

Static analysis result for SHA-256 be28e8aca7f60aa8…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 12:56:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 91c2123a2620de7bf58814edeac6bee7 SHA-1: 2587317ddcc5d5185d216faa832f2fa99d031797 SHA-256: be28e8aca7f60aa8f0f9b668ed0e75bb9f1ef1115541e9f1c6efb853c1acdaee
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with a primary focus on 'Coin Master' and 'Roblox' related hacks and freebies. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a potential phishing or scam attempt. While no scripts were explicitly extracted, the document's structure and content strongly indicate it's designed to trick users into visiting malicious links.

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/coin-master-free-spin-and-coin-links-game-hack In PDF document text
    • https://mbbs.hr/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/real-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-turn-into-super-saiyan-roblox-no-hacks_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/supreme-t-shirt-roblox-hoodi-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-roblox-jailbreak-money-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/new-free-level-6-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/descargar-hack-de-robux-para-roblox-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/robux-only_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/instinct-online-roblox-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-website_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-on-pc_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_off0000319a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x319A 23108 bytes
SHA-256: faa6c099976cbdbe3a839bc2956068814c67c582744c1a8000f9854eb018459a
font_01_sfnt_off000065bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BB 18520 bytes
SHA-256: d69a0a2edd95f9e38b96bcbf992a69ddda142703a71f9cfee81eaec1a075863f

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