Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9f1cab6cd46a6c…

MALICIOUS

PDF

33.8 KB Created: 2021-06-19 18:42:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5f131990223a2746312d27ab1e17ebba SHA-1: 4decc789793084e7256d65fcc5ae5546ce933f64 SHA-256: 2f9f1cab6cd46a6cf959135a464f8c6bb1a49f48c2f9c6d6686816acbfc247e1
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 0.9980

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 http://netcdn.co/app/431946152/roblox-noob-shirt-free-game-hack PDF link annotation
    • https://stmik-kharisma.ac.id/perpustakaan/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/how-to-get-free-robux-legit-no-survey_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/op-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/hacks-for-speed-simulator-2-roblox_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • https://stmik-kharisma.ac.id/perpustakaan/repository/how-to-get-a-free-minecraft-account_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
font_00_sfnt_off00002fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA6 21688 bytes
SHA-256: 555e1d76ba2466956b3cc9d4a8b44bc33b846ff83e3ae0ebb8df162d7c24b902
font_01_sfnt_off00005f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4B 19040 bytes
SHA-256: bf55786138c606e082aa0d90b03b357294dcaa72eb3f5ac55eb24d53eb8e4ca5

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