Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85c153478a4bd12…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 09:02:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a1cb760845a3409ffc7f418f070283f0 SHA-1: 630c6e698a3c91a5e2e8226b90595ab69fee30e9 SHA-256: a85c153478a4bd12a8713ebef6151ee57946f877397007f8f0fa7ae87d758f60
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to `https://netcdn.xyz/app/431946152/free-robux-no-survey-game-hack`, which is identified as a malicious redirector. The document body and heuristics indicate a lure for free game currency or hacks, designed to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for further malicious actions upon user interaction.

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-no-survey-game-hack In PDF document text
    • http://library.polita.ac.id/repository/free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://library.polita.ac.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://library.polita.ac.id/repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.polita.ac.id/repository/coin-master-free-spins-link-download-for-iphone_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_off00004a0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A0F 24976 bytes
SHA-256: 3417e028dcf49199b7f9ed3defd24b0908e12864ccc68d35ba74bfa37cdaf135
font_01_sfnt_off000083b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B3 18308 bytes
SHA-256: d3a10f634c5ecc3d7353c949fdf4d39280fe41fff4e373acd575ae0d5bea3c9d

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