Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe241b331029d75…

MALICIOUS

PDF

46.8 KB Created: 2021-06-11 09:09:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5945e85e6fdbf23caad68df0496ce9f5 SHA-1: cd04f20a3d7f5e818abab20f825195352e1bb19e SHA-256: 2fe241b331029d756589a877d782ad64e14a2c6ee7a7ed4cb4bd55ee7365e18c
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free in-game currency and hacks to entice users. It contains numerous links to external websites, including a known malicious redirector at 'netcdn.tw', and a large number of links to other PDF files hosted on 'easytransferbrazil.com'. These links are designed to lead users to potentially malicious content or further phishing attempts. The document body and heuristics indicate a strong redirection and link-farming pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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 https://netcdn.tw/app/431946152/roblox-free-money-hack-game-hack In PDF document text
    • http://easytransferbrazil.com/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/lua-script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/how-to-get-a-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://easytransferbrazil.com/images/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://easytransferbrazil.com/images/roblox-event-hack_GM431946152.pdfIn PDF document text
    • http://easytransferbrazil.com/images/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004c74.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C74 24948 bytes
SHA-256: 6dbfb7433892910298df9b779dcf8042121bb3c44995d4777665c1ef31a66535
font_01_sfnt_off000085d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D2 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000092e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E3 18720 bytes
SHA-256: 0a688bfc4351de47aec21271dbaa3b7ecd635625fa3d9341c952fb25a1d180b5