Malicious PDF — malware analysis report

Static analysis result for SHA-256 766e7fbde385f6fd…

MALICIOUS

PDF

48.7 KB Created: 2021-06-03 09:31:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3f27a37a92e822d921f9a61ab2d7db9a SHA-1: 4134580fe83a2069366441f99c3b16244f45a422 SHA-256: 766e7fbde385f6fdf5827e955f4f5f66fdb85feb99ea2c8e10905716e3959da4
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.online/app/431946152/redeem-roblox-card-free-game-hack PDF link annotation
    • http://library.umla.ac.id//repository/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/wurst-18_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-do-i-get-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-spin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coinmaster-spins_GM406889139.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
font_00_sfnt_off0000518b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x518B 27400 bytes
SHA-256: e79fa6a581626e1646fdc7f453115174a97ab7ffe5a2cf55339acb3c87666431
font_01_sfnt_off0000910c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x910C 2844 bytes
SHA-256: d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43
font_02_sfnt_off00009acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACC 18612 bytes
SHA-256: 60f5a1d5a0775e45587e850c673dfad554e932795a56f36892a7298ffe0bc887

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