Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3b5a545adab546…

MALICIOUS

PDF

47.8 KB Created: 2021-06-09 08:20:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c56914c08790ca923c9e08df4c573d66 SHA-1: 6aa930c016fc30247754afdbf5d25f9101c3cc1e SHA-256: 2f3b5a545adab546b8c6142153380070a82199e1e1a67d2b1adccff37507c189
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 Robux' and game hacks. The primary lure URL is https://netcdn.tw/app/431946152/rex-points-get-free-robux-game-hack, which is flagged as a malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into visiting these sites, likely for further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.tw/app/431946152/rex-points-get-free-robux-game-hack In PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/free-robux-working_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/robux-page_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/free-minecraft-printables_GM479516143.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_off00004f2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F2F 26848 bytes
SHA-256: 63ee3e9afe16784e113b934e61a896cda1d2e36f0c894046e62869dd8233b1ee
font_01_sfnt_off00008b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3D 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000097e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E4 18392 bytes
SHA-256: 78bc5987f2fe87bbedfa6c3fd58bc70bb4b764bc0099978f27ef28c91445b94b