Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc55b8ab635072f…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 10:35:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 358b29adc3dea10a026c503112cb7f09 SHA-1: c22a7f393d1c9ff2665c251c33fb8e84cfe8e557 SHA-256: ecc55b8ab635072ffe8d84974c5207700e885c8608a7742bc4700afd260baa95
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body and embedded URLs reinforce this lure, suggesting the primary goal is to trick users into visiting a site that likely hosts a malicious download. While no scripts were explicitly extracted, the nature of the lure and the PDF format suggest potential for embedded JavaScript to facilitate the redirection or download.

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/479516143/best-hacked-client-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/picture-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-redeem_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pubg-uc-ucuz_GM1330123889.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/real-robux-generator-2021_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
font_00_sfnt_off000031ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EC 22168 bytes
SHA-256: b0808eeb3e3e5795e08d7c91c34fbcdf25ac15e7be5e322af55826e7a658a292
font_01_sfnt_off000062c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C1 18492 bytes
SHA-256: 903a763f7ab233d5cbfd476072903032bf39c0f6a32515afc0c758fc5aff1474

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