Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b1704869fdc695…

MALICIOUS

PDF

34.9 KB Created: 2021-07-09 11:44:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2b1f244557bbc10162f1fef5154ce041 SHA-1: 577c5e62819ec9e572f89bdfcdbaf24de2c4340d SHA-256: 88b1704869fdc69566ccf400a0a7dbce7f8ab91f5914258f358ecf30f08ef79a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free coins/spins' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-coins-and-spins-link-game-hack, which is flagged as a malicious redirector. This suggests a social engineering attack aimed at tricking users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

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-coins-and-spins-link-game-hack In PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-robux-dont-get-anything-from-survey-varification_GM431946152.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/minecraft-hack-ios_GM479516143.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/cm-spin-link_GM406889139.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-hacked-apk-download-for-android_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_002_off000032d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D3 22392 bytes
SHA-256: 244506e8890d7a44391977885eee3841229d21a1a7d684cb4f17833f0bb8d032
font_01_sfnt_off000064db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DB 18520 bytes
SHA-256: 4a00b74065c845a8261d6cc4e101dd5c2a388e973e7fc9ab28e7679a34d9d18b

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