Malicious PDF — malware analysis report

Static analysis result for SHA-256 7038423aaeaacde5…

MALICIOUS

PDF

35.9 KB Created: 2021-07-05 02:00:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a44529e0961c4e48b2e4a3584480a705 SHA-1: a6bddd1630e962fa9de1aff5fed43cb64f34f7e6 SHA-256: 7038423aaeaacde595aaab4546b688a7020394b3550b4a67b1f6ded44679ac25
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and free currency generators. The primary link, http://netcdn.tw/app/406889139/free-gold-cards-coin-master-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest a phishing or social engineering attempt to lead users to potentially harmful content or further malware downloads. The ML classifier also flagged this PDF with high confidence.

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/free-gold-cards-coin-master-game-hack In PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/roblox-unlimited-robux-apk-free-download_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/minecraft-complete-handbook_GM479516143.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/mcpe-master-free-coins_GM406889139.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/nuevos-cdigos-de-roblox-de-hacks-jailbreak_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/roblox-lua-free-executor_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/how-to-get-free-t-shirt-in-roblox_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/roblox-btools-hacks_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • https://man1tuban.sch.id/__statics/gudangsoal/files/free-robux-gen_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_off000036c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36C0 22904 bytes
SHA-256: 7ce324f6904fcaef66a7cf47aa43202f4fd8e489b46ed935f340ce0b54679660
font_01_sfnt_off000069fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69FD 18244 bytes
SHA-256: c0b0779b34030300e48718c8cf2fdfe9f3dac7abc045aa5c31b1ba45645f0cee

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