Malicious PDF — malware analysis report

Static analysis result for SHA-256 004f8459200c6565…

MALICIOUS

PDF

41.7 KB Created: 2021-05-16 22:03:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cb71f19e18789b5a95789de598386d65 SHA-1: 9b07af7fb93ce87dc99e724557538c6aebd0fc1c SHA-256: 004f8459200c656525223f95f1bfdca90c6cf5d527c81e74e85aa18c4afbd48d
200 Risk Score

Malware Insights

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

The PDF document contains links to malicious redirectors disguised as 'free generators' or 'game hacks', and presents a fake CAPTCHA to trick users into clicking. The embedded URLs likely lead to further malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction for malicious purposes, potentially leading to client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/robux-gratis-game-hack In PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/open-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/roblox-robux-page_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/robux-no-survey_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/40-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/rbx-com_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/minecraft-java-code-free_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
stream_003_off0000443b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x443B 26056 bytes
SHA-256: 11aeddf92ea68b16ab957ec6b8b149e183958ad6c3d8bdc7ecd470576712a4ec
font_01_sfnt_off00008026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8026 18300 bytes
SHA-256: 5b7956b367e7034c1d89c4bcafd3a8b19a23372aa7741d4527a1b7b8c092ce2f

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