Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe28f58eafc11a73…

MALICIOUS

PDF

34.2 KB Created: 2021-07-21 07:44:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: db283a3bcaca4b0863d9181d0ef1fd8e SHA-1: b815ce6d3907cb9861e5068a5684dc165f22a2ca SHA-256: fe28f58eafc11a73a942a0729d3241a768d3a3c712461d83b1b13a56b2498921
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, masquerading as "free generators" or "game hacks" to lure victims. The primary redirector URL is http://netcdn.tw/app/406889139/free-spins-for-coin-master-app-game-hack, which is flagged as malicious. The document body and embedded URLs suggest a social engineering tactic to drive traffic to potentially malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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-spins-for-coin-master-app-game-hack In PDF document text
    • http://genialica.com/images/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • http://genialica.com/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://genialica.com/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • http://genialica.com/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://genialica.com/images/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://genialica.com/images/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://genialica.com/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://genialica.com/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://genialica.com/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://genialica.com/images/free-spins-and-coins-on-coin-master_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
stream_002_off00002f8f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F8F 23540 bytes
SHA-256: d7b7f32dae0ec9fb34d8abc56b64b9caa6019e03229b7e0853a540f0a5ee2a26
font_01_sfnt_off0000650f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650F 17884 bytes
SHA-256: c0e07e045f0496ba68af439e810d5bb13e23b0d850ef9426c095223eaa712aa7