Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75615e5af721587…

MALICIOUS

PDF

36.8 KB Created: 2021-05-23 02:48:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3c12eb29f354b59919c10488e62cca52 SHA-1: 94a98abb3f36f47b67055dbc15e796dcd6e10d0d SHA-256: b75615e5af721587317ee429e9a3bcbce6ede204b31f6d59dc0cb739c154eafd
200 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors, disguised as 'free generators' or 'game hacks' for popular games. It also presents a fake CAPTCHA to trick users into interacting with the malicious content. The embedded URLs likely lead to further malicious content or phishing pages, and the ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/how-to-get-free-robux-no-verification-game-hack In PDF document text
    • https://www.manmed.info:443/images/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/woman-roblox_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-robux-on-roblox-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
font_00_sfnt_off000032c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32C4 25216 bytes
SHA-256: 3774f4c14b4462082be80b16e1aee45b0ea48a73382fb746101095491360c7e9
font_01_sfnt_off00006cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF0 18764 bytes
SHA-256: a0d8f559ae1a84b7fc559fdee6dca3899797d6ff6e3d64572866459a8961df23

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