Malicious PDF — malware analysis report

Static analysis result for SHA-256 39af750d71f66ecb…

MALICIOUS

PDF

45.2 KB Created: 2021-05-11 15:05:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 72b2dd90169538acdae1c5fbbd25b447 SHA-1: e980d2b7245371929e826cf84f33d9c0428f280d SHA-256: 39af750d71f66ecb1ab7f1da1394d4740c73b60bfe9c64797a42e3f88b9c3421
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "Robux Generators" and "game hacks". The primary redirector URL identified is https://netcdn.xyz/app/431946152/robux-generator-no-verification-2021-game-hack. This indicates a social engineering lure designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly suggest a phishing or scamming attempt.

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 https://netcdn.xyz/app/431946152/robux-generator-no-verification-2021-game-hack In PDF document text
    • https://www.banhngoncaocap.com/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/coin-master-homepage_GM406889139.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/coin-master-villages_GM406889139.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.banhngoncaocap.com/images/free-coin-master-hack-no-verification_GM406889139.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_003_off00004a88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A88 28836 bytes
SHA-256: 9618b4e7d63019db3d82191e65ec09724efe10a49108fcf432f2e392257f17ee
font_01_sfnt_off00008ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA7 18836 bytes
SHA-256: 70c9af4927528042a9e3503934bee4caa1d9283cda5f59bc037173645e872bda

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