Malicious PDF — malware analysis report

Static analysis result for SHA-256 1455d43e31b9ca55…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 13:33:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 42bb0599720d3ecf2e7e8fd52bf296d8 SHA-1: a31c43a0902469788536e84b5e734a6ef6e62437 SHA-256: 1455d43e31b9ca55078bf8b8c7553e00676bb52066ca1ddd41f1e58c86fb6079
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, masquerading as game hacks and generators. The document body and embedded URLs suggest a lure to download further malicious content, likely a second-stage payload. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains links designed to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-hack-2021-android-game-hack In PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-promo-code_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_004_off000050df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DF 25104 bytes
SHA-256: 7aee4b3009d8b703abdcdc541dd4e2b5d77b791d58e36a373c7fdba574207e05
font_01_sfnt_off000089f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F6 18292 bytes
SHA-256: 27f4b60df4c5b9b58df513bbeae6e0a7300ac945a9a466f89e8a511806a668c2

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