Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef45228fc6a2376…

MALICIOUS

PDF

43.3 KB Created: 2021-05-16 15:36:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fccb30aec283ca62f5151087dfb6b320 SHA-1: 3c11abecbb19564f0a95258f2f17fd07e8c27472 SHA-256: 2ef45228fc6a2376fb171986462dabe1f2fae735b29f3176502fec1d4b241724
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically targeting users with "game hack" and "free generator" lures. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-hack-no-survey-game-hack, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a workflow designed to lead the user to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/406889139/coin-master-hack-no-survey-game-hack In PDF document text
    • http://yochin.org.tw/images/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://yochin.org.tw/images/give-free-robux_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://yochin.org.tw/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • http://yochin.org.tw/images/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000045cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45CF 24292 bytes
SHA-256: 9ce6e2b03f19344ee4b35da11a51b194f009ac01d35c41be0b22684e2ad7b647
font_01_sfnt_off00007d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D11 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000086fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86FC 18148 bytes
SHA-256: 55a2c5e1b7f94918972dbf36de35b773a73c2c126b1f6e018f905b5ffe646750

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