Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5677ba6941c31d…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 23:15:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 330a23945c56b01cb869b5089cea21ea SHA-1: 8e3c906f945ce177b0c9419990f92f20095f2e57 SHA-256: 7c5677ba6941c31d48e4380e45f5b7e1a866d3d0bf8d46c627d07f9197d2e7d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that is identified as a malicious redirector, specifically a lure for a 'free generator / game hack'. The document body and embedded URLs reinforce this by mentioning game hacks and free spins. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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/download-coin-master-hack-tool-v1-9-game-hack In PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/code-for-free-obc-and-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-annualy-robux_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/exploit-engine-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.thamrin.ac.id/repository/how-do-u-hack-roblox_GM431946152.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_off00003038.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3038 23336 bytes
SHA-256: db4800d8f7ad14bdcfff010a062a1830b4a8af0fb7ed1eddac797217ad0632c6
font_01_sfnt_off00006452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6452 18988 bytes
SHA-256: d690daf4a72672f829000763fc4259cf15b2945cba964cb3cfe081013f67300a

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