Malicious PDF — malware analysis report

Static analysis result for SHA-256 843da5a1c9ec4cf1…

MALICIOUS

PDF

52.1 KB Created: 2021-05-30 23:23:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 92fdec52abc42689c7660a8b09bbae1a SHA-1: c48cba26654ac6a090c9866b7c2f295a769496d4 SHA-256: 843da5a1c9ec4cf133ffa4619310a643907cf523bec57eb2565e373271ac3007
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are SEO-optimized and point to files related to popular games and online services, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the intent to trick users into downloading content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7419

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.xyz/app/431946152/how-to-hack-into-someone PDF link annotation
    • https://spear.com.hk/wp-content/files/fsqm-files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdfIn PDF document text
    • https://spear.com.hk/wp-content/files/fsqm-files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00005442.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5442 25824 bytes
SHA-256: 61a08064cec65e81b2c5878211ce2ae09b040b7a671477c128f5750ac765d6d1
font_01_sfnt_off00008f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F62 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9947 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA659 18912 bytes
SHA-256: bf4ecd0153dd3a330a8d8544a3db10b129edd23679e66a7dba01ca4f284b0ccb