Malicious PDF — malware analysis report

Static analysis result for SHA-256 27851f9184b44da3…

MALICIOUS

PDF

46.8 KB Created: 2021-05-12 15:32:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ad2764c491c3136efecfb34b5db1e332 SHA-1: 0877372d26056ac114075f62521273cade111664 SHA-256: 27851f9184b44da3602094e9c1b87e897dd8116ccad591934ebb9c9beb1c4a32
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary malicious URL identified is https://netcdn.xyz/app/431946152/rbxoffer-com-free-robux-game-hack. This pattern suggests a social engineering lure to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/rbxoffer-com-free-robux-game-hack In PDF document text
    • http://croatia-flyfishing.com/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-connection-lost_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/get-free-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/rbxfree-com-free-robux_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_off00004969.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4969 27448 bytes
SHA-256: 66ca0c706a6edeeb2b54b5cf61805e84e636bae1ecb342afb64d1c7268556c9f
font_01_sfnt_off0000877b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x877B 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000948d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x948D 18276 bytes
SHA-256: 9aeb6f41d3354634239b7c8beac9b422ae3978a513a1679011b82127add4d155

Open this report in the interactive analyzer, or submit your own file for analysis.