Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30376c0d92ff437…

MALICIOUS

PDF

44.7 KB Created: 2021-05-11 18:36:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d5aa82d4578e80ef6c0434d6e8cd2904 SHA-1: 397001d0718c5d26694b2999ae78f7a2070fabb0 SHA-256: d30376c0d92ff437bccd8395362334e5f61e79b39d9986a953408c8abcfbab6a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free Robux'. The document body, though partially garbled, contains text and URLs consistent with a social engineering lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-no-verification-game-hack In PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/100-robux_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-tricks_GM406889139.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/coin-master-free-spins-apple_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_003_off00004bae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BAE 27500 bytes
SHA-256: 44e13c1864cbdc175f99b6c1d2aac60efe312f96e157882c9c4d3edcb9b89263
font_01_sfnt_off00008b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1C 18764 bytes
SHA-256: a0d8f559ae1a84b7fc559fdee6dca3899797d6ff6e3d64572866459a8961df23

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