Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f59868ba05877f…

MALICIOUS

PDF

46.6 KB Created: 2021-06-02 12:19:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 319b8ae02a7e77905e998c18ffa093d5 SHA-1: b3f2e82ad24e8e6087f77f2ab7519269b459ecae SHA-256: 53f59868ba05877f53b72b2fafb350408418a54b56bb01f9234b9bca33fa9fa1
180 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising "game hacks" and "free spins" to lure users. The primary malicious URL identified is https://netcdn.xyz/app/431946152/event-ykm-simlatr-roblox-hack-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a malicious redirector pattern, likely exploiting a PDF vulnerability to execute a payload or redirect the user to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/event-ykm-simlatr-roblox-hack-game-hack In PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-draw-roblox_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/pokemon-go-free-12-km-eggs_GM1094591345.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/free-100-robux_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_004_off00005474.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5474 26716 bytes
SHA-256: 144587d16e0583dad5e324a9cffd110b50162b6b5d47b52877a416ab21fadbb1
font_01_sfnt_off000091ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91CE 18940 bytes
SHA-256: 83b8714f172b9e346b036da1d27a26de3a75aa0d7fee2ecc71f25091942220e1

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