Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ca521d389be5c5…

MALICIOUS

PDF

31.8 KB Created: 2021-07-20 23:12:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e6f6cda551c4d0b72c98d9cb691e25f6 SHA-1: 75a59379009f7ac3bd50022f62b55480d2e34860 SHA-256: 25ca521d389be5c55edf6d16db5511f44525c298acee1c9896d5b80b160592df
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary malicious URL identified is http://netcdn.tw/app/479516143/free-minecraft-account-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/free-minecraft-account-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/free-tiktok-comments_GM835599320.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/can-u-get-free-robux_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_off00002b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B35 21916 bytes
SHA-256: 130162d83e27e52a20cf41c3152eceb5fdffb3c84822bfc73f47edd5db0f8f6d
font_01_sfnt_off00005b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8A 17848 bytes
SHA-256: 6e6a79a2e8d921ce4110ee7bea64574f9639f41d67ba7d7747bc91dcd849eff6

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