Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e68afc4c708cef…

MALICIOUS

PDF

37.0 KB Created: 2021-05-21 02:56:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4c38cfe015273934e9de86745fd6c4c8 SHA-1: d00dbf6623b7dd3924614bd6041a1ce4fc533efd SHA-256: a7e68afc4c708cef25ad2f3c3f66b94498fa538223bdb69ce1eb3041c57c6a2a
200 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to known malicious redirectors, masquerading as a "free generator" or "game hack". The document also displays a fake CAPTCHA or human verification prompt to trick users into interacting with the malicious links. The presence of these elements strongly suggests an attempt to lure users into executing malicious content or visiting compromised sites.

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/479516143/games-like-minecraft-but-free-game-hack In PDF document text
    • https://kimolos-link.gr/images/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/no-robux_GM431946152.pdfIn PDF document text
    • https://kimolos-link.gr/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://kimolos-link.gr/images/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • https://kimolos-link.gr/images/coin-master-hack-cheat-generator-coins-and-spins-unlimited_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_off00003562.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3562 25848 bytes
SHA-256: d5d4ff78418ac34508df6f896d1b3ed6312b8dd8b0c89b995a8f32f0c31730d2
font_01_sfnt_off00006f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5E 18352 bytes
SHA-256: 6b77667e5393daef3d5c6d964ee9e1e8f0bf8aa621da45ad5803b98c0c35dbed

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