Malicious PDF — malware analysis report

Static analysis result for SHA-256 305b58c77d0c2772…

MALICIOUS

PDF

33.5 KB Created: 2021-06-28 18:55:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 50cb6611077b82feb6fa02f217752050 SHA-1: 8134fd6ce57cb7b4cbf8c92fa29355bb392bd982 SHA-256: 305b58c77d0c2772c98f23203e2f81c27722ee8a1e11f991326f3e97a260c9ba
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as legitimate sources for game-related cheats and currency. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or exploit kits. The document's content and structure strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.co/app/431946152/roblox-project-jojo-free-items-exploit-game-hack PDF link annotation
    • https://vosco.vn/uploads/vosco.vn/files/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-roblox-card-generator_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-november-2021-easy-hacks_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-be-a-roblox-hacker-and-hack-accounts_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-do-sword-roblox-hack_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/tiktok-free-shares_GM835599320.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-git-free-privert-servers-in-roblox_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AAF 22268 bytes
SHA-256: b8ab3410ebbd4dd92114cadc86132c0c7b20aca9a9b5b400f1f2ec4831295841
font_01_sfnt_off00005c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C23 19816 bytes
SHA-256: 8705056eb7e7f6700d88183082b610ee0179be297385d9b9be6508ac224bbfaa

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