Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5865296c2a0312…

MALICIOUS

PDF

39.7 KB Created: 2021-05-21 07:44:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: edc7c0ec26f7e724bbb8bf0ef13fbe6c SHA-1: 8ca067ae1706818d19b715096b39acd44ee7d4a9 SHA-256: ac5865296c2a03127018042829c693a4caf3f8fe2ca96eae65d5fc2898015cbc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to malicious infrastructure, specifically advertising a "Roblox Free Robux No Verification" generator. The heuristic firings confirm these links are associated with malicious redirectors and game hack lures. While no scripts were explicitly extracted, the PDF structure itself contains actionable links designed to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 4

  • 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.
  • 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/roblox-free-robux-no-verification-game-hack In PDF document text
    • https://cfla.gov.lv/userfiles/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cfla.gov.lv/userfiles/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • https://cfla.gov.lv/userfiles/files/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • https://cfla.gov.lv/userfiles/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://cfla.gov.lv/userfiles/files/robloxmatchcom-free-robux_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_002_off00003307.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3307 31672 bytes
SHA-256: 8d2faf50aa004bc604afb581f598694f8e47dfbaea5356ba5e59158f576eaa0c
font_01_sfnt_off00007928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7928 18676 bytes
SHA-256: d88aecf2630d4fcf6e85b9a2b5560aad6055705ec2bb19cbd5d89ce1bd292ac8

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