Malicious PDF — malware analysis report

Static analysis result for SHA-256 51444d358bb1a66a…

MALICIOUS

PDF

42.0 KB Created: 2021-05-13 17:30:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2912e5a1a6b6c1dfab340a9e2f08f3e0 SHA-1: fa4ef56ee262f45d7493da603431f7fc41d2cbf9 SHA-256: 51444d358bb1a66ab6b68b659376ae303ba4d689ed98a67bb7a48054be1799a7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising free Robux generators and game hacks. The heuristic firings indicate that the PDF is designed to lure users to this malicious URL. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests an attempt to redirect users to a malicious site for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-robux-generator-com-roblox-hack-game-hack In PDF document text
    • http://leigraphics.com/images/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://leigraphics.com/images/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://leigraphics.com/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://leigraphics.com/images/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://leigraphics.com/images/coin-monster_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • http://leigraphics.com/images/how-to-hack-coin-master-ios_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_off00004774.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4774 24684 bytes
SHA-256: f52a36935459fc7f2f60e33ca7555c08faa3a34117a446e7e6aa400a144e0960
font_01_sfnt_off00008028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 18852 bytes
SHA-256: 4f913a2277500713712aa6cd09c4e12b5f8093088fb24eab89a43b1b22929045

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