Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf34fc467ea5c05…

MALICIOUS

PDF

44.6 KB Created: 2021-05-11 15:34:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e434e53398311d07f8d6dc078d15b7a2 SHA-1: 7e54d32435732df636ac21dfa14af6b8b6927b6a SHA-256: fbf34fc467ea5c0556e7fdaec73979bfcfcbf48bb82861cc327a0f10776d3672
200 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a 'free generator' or 'game hack' lure, which also displays a fake CAPTCHA to trick the user. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL which likely serves as a gateway to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.xyz/app/431946152/free-roblox-shirts-templates-game-hack In PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/e-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/coinmaster-links_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/150-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://www.e-learning-mts-sirojulhuda.com/__statics/gudangsoal/files/wurst-client_GM479516143.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_off00004ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC9 28100 bytes
SHA-256: 882cf82ceaed921dada8edd23834f9d6901f3c63f98aa26154ee0b201719789d
font_01_sfnt_off00008a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A23 19000 bytes
SHA-256: 9846c57f19aefef1863ce0f19602eeffc36beb237370d9673c8368dba1a12ee8

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