Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fceba64a42ec8a3…

MALICIOUS

PDF

46.0 KB Created: 2021-06-09 11:16:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e1df58b277fce55fd1f42082fe393e57 SHA-1: d4e190841ea8a6e1fefd88493f0f2ecba8365e8a SHA-256: 8fceba64a42ec8a3ef8f7ecfc0bfbccf5cbef6fede09e3b909e13dd43b78cd4f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/how-to-do-knife-hack-on-roblox-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/master-coins-free_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/2021-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/roblox-link-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/dominus-roblox-free_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_004_off000052bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52BC 26788 bytes
SHA-256: 3b0457b42a9f8bc8e410dc7f6662bba453b9693ef479b41df0752452c753d8f1
font_01_sfnt_off00009036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9036 18632 bytes
SHA-256: eb3be42bb9d3a9b451fe30ea644b389f5eb1b6db16aa3ddd8bae4f4897561805

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