Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfa2cb0a6d6e325…

MALICIOUS

PDF

50.5 KB Created: 2021-06-09 15:38:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4c1884469b19a9cf2294ebcd6eb70a8f SHA-1: d67af478befffcbae27b52fc5e9b59258e7b29f1 SHA-256: adfa2cb0a6d6e325abdc95bfd5b55b77dd785a0dfddb393256a8e06710462b5c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to host malicious content. The document body, though partially corrupted, suggests a lure related to 'free Roblox Advertisement' and 'game hack', aligning with the heuristic findings of a PDF URI and a link farm. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security controls by providing password instructions for a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-roblox-advertisement-game-hack
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-robux-with-cheat-engine-64_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/all-roblox-gamepass-free_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-jailbreak-cheats-2021_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/synapse-hack-roblox-download-free-2021_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-money-in-mad-city-in-roblox_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-one-piece-ocean-voyage-hack_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/pastebin-free-robux-by-agarminer_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-coins-coin-master_GM406889139.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/minecraft-windows-10-hacks_GM479516143.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-cheat-engine-62-download_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-gift-card-codes_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-hack-on-roblox-saber-wars-alpha_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/hack-de-matar-gente-roblox_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts-v3rmillio_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/rbl-gg-free-robux_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/caillou-roblox-hack_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-speed-hack-on-roblox-jailbreak_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/get-free-robux-fast-and-easy_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000551b.bin
c785dd3cf10f0e3ae8059eda6c18887c68d11c8335029e0a3c804a48e10bf752
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x551B 26800 bytes
font_01_sfnt_off00009451.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
pdf-font-stream PDF embedded font (sfnt) at offset 0x9451 5696 bytes
font_02_sfnt_off0000a162.bin
0997f51d6c7c794842f13df5c9ac968cc09f2d75ffefcbd0d108318154bbd10f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA162 18720 bytes