Malicious PDF — malware analysis report

Static analysis result for SHA-256 243af044f825f934…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 09:25:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a60c6f2243963461781fa7987e858d99 SHA-1: cf638802c5803ab6e46f578d8bcf934ce30b027a SHA-256: 243af044f825f934668e3ae2afe985f083894d3fc2a4ac20c02d57713ad6742e
160 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that redirect to malicious infrastructure, masquerading as game hacks or generators. The primary lure, http://netcdn.tw/app/406889139/coin-master-level-4-game-hack, is flagged as malicious. The document's structure and content suggest an attempt to trick users into visiting these sites, likely leading to further malware downloads or exploitation.

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/406889139/coin-master-level-4-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/speed-hack-roblox-cheat-engine-62_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/cheat-roblox-lumber-tycoon-2-terbang_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/boku-no-roblox-remastered-free-account_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-lost-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-put-shirts-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-bio-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-please_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-works-no-survey_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/pubg-uc-exchange_GM1330123889.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-video-proof-for-hacks_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-pe-free-ios_GM479516143.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_off00003006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3006 22424 bytes
SHA-256: 5d996aee35165b79248dd79a48af7e1683e497057ea368759ad4d78de658492f
font_01_sfnt_off00006214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6214 18084 bytes
SHA-256: 2b25429d4f62ce8bcc27b9cefab35a7be2cc11d3dff90dca1f7975a4c2ff109a

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