Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57a8f14b3c033b3…

MALICIOUS

PDF

31.2 KB Created: 2021-07-22 04:12:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 34e0097c36467a32115eced55422e9f1 SHA-1: 6d07ea2024170ecb963d0ad9adc73d0be4709fb8 SHA-256: a57a8f14b3c033b3dd58f07fb3bce2d9793ece55a91b95f2fc6c3b7de273309f
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 'free game hacks' and generators. The primary lure URL is http://netcdn.tw/app/479516143/how-to-get-minecraft-java-edition-for-free-game-hack. This indicates a phishing or scam attempt designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded links are sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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/479516143/how-to-get-minecraft-java-edition-for-free-game-hack In PDF document text
    • http://winnerwater.com.tw/image/data/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-tiktok-views_GM835599320.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-windows-10-free-code_GM479516143.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
font_00_sfnt_off000027ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27CE 21860 bytes
SHA-256: c65754a10430b97b7d4f0c8a364376a89623a567118a2775bea6dec66e8ee8eb
font_01_sfnt_off000057ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57AD 18328 bytes
SHA-256: a790f51109e75a7469d42ca78e2bb2ee6ca1fa0985c1c579ea7802a52011e373

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