Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f7ec1fd8e69979…

MALICIOUS

PDF

45.7 KB Created: 2021-06-07 05:56:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c2261479ba6a1274a4632d061ac778a2 SHA-1: b6f342d2e3401fb8ea4ff5895dde809ca21afdb5 SHA-256: 98f7ec1fd8e69979413850a4b982ed7be1c63f94c3e22cbda3ca6e0c5e16d9f5
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to trick users into clicking a malicious link, disguised as a 'free generator / game hack'. The embedded URL, https://netcdn.tw/app/431946152/free-robux-without-sever-game-hack, is known to lead to malicious redirector infrastructure. The document's structure and content strongly suggest an attempt to exploit user interest in free in-game items to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-without-sever-game-hack In PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/how-to-have-free-robux-2021_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
stream_004_off000052ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CE 25648 bytes
SHA-256: 871bedce8e6e507743d2ce6e8441348639c4b7b5aa02b15c1dd187ebde70910a
font_01_sfnt_off00008ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC8 18716 bytes
SHA-256: 8128741b7dbd0b58d156df1a9e2d7053efa118b15bdb1c02d7f98a65e758b6c8

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