Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a84e5d0e86c3a9…

MALICIOUS

PDF

47.7 KB Created: 2021-05-19 08:35:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f70de4fefc4fb48e30f4b83c9c9f19aa SHA-1: 142e09f92c4c285508356422ad7e61e6eec04500 SHA-256: c3a84e5d0e86c3a95294520eb7564df574a30787c35b1f5d8aed152e33027cf0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The primary malicious activity observed is the redirection to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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/free-robux-gift-card-codes-2021-game-hack In PDF document text
    • http://brinicombe.co.uk/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/best-hacked-client_GM479516143.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d6a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D6A 26656 bytes
SHA-256: 968a8fcbbeb2eeae40e999833746fbc66cce90e088d1f8afcca17a4f42564150
font_01_sfnt_off00008bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFC 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000095ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95AB 19044 bytes
SHA-256: a83203ba6d4d8e4db234da74518c811315008a13a6a61ff598d06d89853e7c2b

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