Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc24226f5ac01ac…

MALICIOUS

PDF

34.5 KB Created: 2021-06-19 08:29:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 07e1bdc1ea2e225dc2faaf2f5d4b5960 SHA-1: fd0df84ea23493b9506610239abb4f56125397c4 SHA-256: 3fc24226f5ac01acffbb513331a74cdbc92c510515ce0fc6091555bddb3c2a4f
182 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. It uses a password-protected-archive lure. 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 6

  • 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.
  • 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 http://netcdn.co/app/431946152/roblox-free-cape-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-on-ipad-mini_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-generator_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-search-for-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-hack-download-no-survey_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-10-000-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-working-free-robux-games_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-and-coins-from-coin-master-game_GM406889139.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
stream_002_off000030f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30F7 22332 bytes
SHA-256: b2bdb292613c18c0096d16951e3d065ad7cbae1b22299b4880ceb03f79abf2d1
font_01_sfnt_off00006273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6273 18824 bytes
SHA-256: 7f83fc17023c9b4e145928a2c8995e2627c870c303a828cfbc5420a41988e0e6

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