Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b804aa3bca2512…

MALICIOUS

PDF

49.2 KB Created: 2021-06-08 17:49:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3e7f56675e8a0d918b8c1bfdc41177d1 SHA-1: 46f1d4ebb576ab299c51cb14b878117084627497 SHA-256: d8b804aa3bca2512a70d72fa5a4ce1d2a899dbb3ce4fa197b7dc1ea556a93728
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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/how-to-change-your-clothes-on-roblox-for-free-game-hack PDF link annotation
    • https://perpus.upp.ac.id/digilib/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-call-of-robloxia-5-cheats_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/facebook-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-do-i-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-hack-2021-admin_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-roblox-gift-cards-live_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/pokemon-go-free-items_GM1094591345.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-windows-10-edition-free-with-java_GM479516143.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_004_off000050f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F9 26184 bytes
SHA-256: 2f39f8789451a639472dcc74c6edea9e7a91fd7c090373855c295c75ca3c6228
font_01_sfnt_off00008dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC1 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD2 19200 bytes
SHA-256: bdea2544802ad7f65b8412d98fb694edfd05101ff92cdc9db8b1ab4e7543484b

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