Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13fef4d0429e766…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 02:17:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b033c31d28b8a8b04fa791b07bd0e128 SHA-1: f4d554e6f4b73d8cf3fcf8328c2213871c2ace2f SHA-256: b13fef4d0429e766152cdfe1bb515171be50ac4a3370dcfb5b67e32387f5f384
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and lures, specifically advertising 'free generators' and 'game hacks' for popular games. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-spin-and-coins-links-game-hack, which is flagged as malicious. While no scripts were extracted, the document's structure and embedded URLs strongly suggest it's designed to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

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-free-spin-and-coins-links-game-hack In PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/assain-2-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-account-that-has-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-no-human-verification-2021-pc_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-cheat-engine-bypass-march-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-minifigure-codes-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/tiktok-free-hearts-apk_GM835599320.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-download-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3027 22748 bytes
SHA-256: de9a549dfe871cc5927eedcf49f07996f9f95fbd1506ec5ca1a1764e3ec32269
font_01_sfnt_off00006337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 18520 bytes
SHA-256: d69a0a2edd95f9e38b96bcbf992a69ddda142703a71f9cfee81eaec1a075863f

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