Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef612de1bc717df…

MALICIOUS

PDF

31.1 KB Created: 2021-07-21 01:43:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f9ca4526c6e03b4211dae31b977efd83 SHA-1: 2e3772ff74f124fec9c9e85a68bcd782ef2f315b SHA-256: 6ef612de1bc717dfd12baffa6d36a5029f7da5368d2bb32bafd1d4e730804940
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, disguised as offers for free game hacks and currency. The primary lure URL is http://netcdn.tw/app/479516143/minecraft-font-free-game-hack. The document's structure and embedded links strongly suggest a phishing or scam attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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/minecraft-font-free-game-hack In PDF document text
    • http://lib.mbp.ac.id/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.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_off0000262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x262A 22800 bytes
SHA-256: b68104d9eda104f903e1e55697b27bc363fb3845e86dbe42906c3e101c934362
font_01_sfnt_off00005937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5937 17712 bytes
SHA-256: 48684535abb05df1a4efb13fd94135dee175bf6b61229e4eaa41ff3ed13e5a52

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