Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd31f8b590e3b8f6…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 13:47:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2fc0b8b1e6cc46c1ddc311f0995accc0 SHA-1: e285c90811438ce1b04353f5162a76cf85d66f84 SHA-256: dd31f8b590e3b8f6ba96b7857376553ee1b2893b74cec37a9c7a1afd15264d59
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically promoting 'free generator' or 'game hack' lures. The primary link, http://netcdn.tw/app/431946152/how-to-get-free-robux-on-roblox-game-hack, is flagged as malicious. The document body and embedded links suggest a social engineering tactic to trick users into downloading further malicious content. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate a malicious intent.

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-on-roblox-game-hack In PDF document text
    • http://library.umla.ac.id/repository/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/tiktok-free-package_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id/repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/mcpe-116_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/20210-pubg-uc-in-indian-rupees_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-fan_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
font_00_sfnt_off0000304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304B 22348 bytes
SHA-256: e36f895818950d388fcd2bfa0dda7177f9a7a5e5419749eb0d5181d46c1267f3
font_01_sfnt_off00006211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6211 19056 bytes
SHA-256: 22e79bf31db193f266ad8ef0f47d1a9e736b831aec58415b80c9b2f57893c59e

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