Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff2fc72ad8371f4…

MALICIOUS

PDF

46.6 KB Created: 2021-06-08 21:13:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 594169918fc61e57879630b5732c2788 SHA-1: c65b2a0b83fd4ddabbb08af56cc14564000d0850 SHA-256: 0ff2fc72ad8371f4d8509f4f4fc23bdd30f5777b302bf3c49b5b1e1b83731339
102 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are structured as SEO link farms, suggesting an attempt to distribute or redirect users to malicious content. The document body, though partially corrupted, contains references to game hacks and a URL that aligns with this theme. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/roblox-piano-hacks-game-hack PDF link annotation
    • http://www.zdravazena.sk/images/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://www.zdravazena.sk/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://www.zdravazena.sk/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.zdravazena.sk/images/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.zdravazena.sk/images/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.zdravazena.sk/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.zdravazena.sk/images/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://www.zdravazena.sk/images/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://www.zdravazena.sk/images/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • http://www.zdravazena.sk/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://www.zdravazena.sk/images/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.zdravazena.sk/images/robux-hack-not-patched-2021_GM431946152.pdfIn PDF document text
    • http://www.zdravazena.sk/images/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.zdravazena.sk/images/people-on-roblox-who-give-free-things_GM431946152.pdfIn PDF document text
    • http://www.zdravazena.sk/images/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.zdravazena.sk/images/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.zdravazena.sk/images/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://www.zdravazena.sk/images/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://www.zdravazena.sk/images/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.zdravazena.sk/images/how-to-get-minecraft-windows-10-for-free-2021_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_004_off00005201.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5201 27972 bytes
SHA-256: d768d451d1d0297f2d8299fdaa38becef873db8e7c24e9b03f80b3f39789a21b
font_01_sfnt_off0000934a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x934A 18456 bytes
SHA-256: 66b1b43052cc938b35f70d716a06bf4ec3233c3b3efd9cef33d5b64039311608

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