Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9ac22ffa19ab4f…

MALICIOUS

PDF

44.0 KB Created: 2021-05-12 07:10:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b65996b3d2246b7787f2a73a52c8855c SHA-1: 7931ef062a96ab86aee0d2e68c1fe7439e640786 SHA-256: 8f9ac22ffa19ab4ffb180ff0b09127f7ad1e7a47b7ba3a0d3b8bacf3408d2552
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and generators. The primary lure URL is https://netcdn.xyz/app/479516143/minecraft-free-download-chromebook-game-hack. This indicates a phishing or scam attempt designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/479516143/minecraft-free-download-chromebook-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/www-roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-minecraft-skins-pe_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/kuso-icu-roblox-hack_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_003_off00004f19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F19 25040 bytes
SHA-256: 0bc0dbc7006280299a3a5e8ab0318318e2ebae0fdea36bd87c0310e6779caae8
font_01_sfnt_off000087a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A7 19044 bytes
SHA-256: 5dd9560c2144c6e0c163b4f028c4225137fae20b1a5cdfb52854f5b1068f3385

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